Одну секунду
Что-то сучилось. Попробуйте еще раз.
DSE C P смотреть последние обновления за сегодня на .
Kylan Fung 簡介： 十年日校經驗、曾任教林裘謀、鄭榮之、銘基等英中，經驗豐富，熟知不同程度學生的學習難點。 DSE數學 5、HKCEE 數學及附加數全 A。 憑自創技巧和計算機程式，用一半時間完成試卷，輕易取得最高等級，實力證明。 曾任HKDSEAA 公開模擬試譔卷員，透徹了解DSE考核內容，熟知考試重點、答題技巧和題目陷阱。 10年教學生涯，學生 100% 公開試合格。
This video tackles Q34 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q34。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 0:10] Intro [0:11 - 2:23] Solving (method 1 - traditional) [2:24 - 5:49] Solving (method 2 - (should be somehow) quicker) 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Logarithmic_transformation
This video tackles Q31 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q31。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 0:24] Intro [0:25 - 1:01] 高佬食最少，矮嘅食最多 [1:02 - 2:48] Solving (Only use HCF to determine the answer) [2:49 - 4:33] Demonstration on LCM [4:44 - 5:00] Outro (Comment your thoughts below!) 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #HCF #LCM
Part (ai): (0:00) Part (aii): (4:36) Part (bi): (8:41) Part (bii): (14:46)
This video tackles Q5 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q5。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 1:31] Solving [1:32 - 1:57] Illustration with diagram 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Approximation
修正: 7b) (12-7)/5 - - 3) = 5/8 10b) 應該係24x^2 + 96x = 0, 抱歉 9B) 平均值= (12x3 + 9x17 + 5 x 22 + 3 x 27)/20 = 19 文本傳送門： 🤍 Marking 傳送門： 🤍
This video tackles Q18 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q18。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 0:28] Intro [0:29 - 0:45] Mark information on the diagram [0:46 - 0:59] Solving strategy (for questions about geometry) [1:00 - 2:22] Solving 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Plane_Geometry
Reference： 🤍 HKDSE Maths 數學天書 訂購詳情︰🤍 DSE Maths 數學 Past Paper Solution (e-Book)︰ 🤍 DSE Maths 數學 Past Paper Solution︰ 🤍 DSE 數學 Core 天書 A 的內容︰ 🤍 1 Estimation and Error 估算及誤差 2 Numeral Systems 進制系統 3 Number System 數系 4 Quadratic Equations 二次方程 5 Functions and Graphs 函數及圖像 6 Exponential (Index) and Logarithmic Functions 指數及對數函數 7 More about Graphs 進階圖像 訂購表格及方法︰ 🤍 Herman Yeung HKDSE Maths 數學 Core 課程： 超過 100 小時 YouTube 免費課程 共 12 本天書完成整個 HKDSE 數學 Core (中一至中六) 要考的所有課題， 適合任何考 HKDSE 的同學上課 (中四至中六都合適) (p.s. Herman Yeung 所有天書，中英對照) 全港 最多 觀看次數 的 HKDSE 學習平台 ~ 打破舊有教育模式，增加 DSE 學習效率 !
HKDSE Maths 數學天書 訂購詳情︰🤍 DSE Maths 數學 Past Paper Solution (e-Book)︰ 🤍 DSE Maths 數學 Past Paper Solution︰ 🤍 DSE 數學 Core 天書 C 的內容︰ 🤍 1 Coordinate Systems 坐標系統 2 Polar Coordinates 極坐標 3 Straight Lines 直線 4 Equations of Circles 圓形方程 5 Locus 軌跡 6 Transformation & Symmetry 變換及對稱 訂購表格及方法︰ 🤍 Herman Yeung HKDSE Maths 數學 Core 課程： 超過 100 小時 YouTube 免費課程 共 12 本天書完成整個 HKDSE 數學 Core (中一至中六) 要考的所有課題， 適合任何考 HKDSE 的同學上課 (中四至中六都合適) (p.s. Herman Yeung 所有天書，中英對照) 全港 最多 觀看次數 的 HKDSE 學習平台 ~ 打破舊有教育模式，增加 DSE 學習效率 !
This video tackles Q1 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q1。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 – 0:53] Reminder on Index Law [0:54 - 3:01] Solving [3:02 - 3:14] Use of calculator (exam skill) [3:14 - 3:26] Outro 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Index_Law
This project was created with Explain Everything™ Interactive Whiteboard for iPad.
This video tackles Q10 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q10。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 1:30] Solving [1:31 - 2:03] Illustration with number line 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Inequalities
HKDSE Maths 數學天書 訂購詳情︰🤍 DSE Maths 數學 Past Paper Solution (e-Book)︰ 🤍 DSE Maths 數學 Past Paper Solution︰ 🤍 DSE 數學 Core 天書 F 的內容︰ 🤍 1 Properties of Circles 圓的特性 2 Identity & Formula 恆等式及公式 3 Polynomials 多項式 4 More about Equations 續方程 訂購表格及方法︰ 🤍 Herman Yeung HKDSE Maths 數學 Core 課程： 超過 100 小時 YouTube 免費課程 共 12 本天書完成整個 HKDSE 數學 Core (中一至中六) 要考的所有課題， 適合任何考 HKDSE 的同學上課 (中四至中六都合適) (p.s. Herman Yeung 所有天書，中英對照) 全港 最多 觀看次數 的 HKDSE 學習平台 ~ 打破舊有教育模式，增加 DSE 學習效率 !
This video tackles Q40 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q40。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 2:58] Solving (part 1) [2:59 - 3:32] Exam tips [3:33 - 5:00] Solving (part 2) 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Equations_of_circles
HKDSE Maths 數學天書 訂購詳情︰🤍 DSE Maths 數學 Past Paper Solution (e-Book)︰ 🤍 DSE Maths 數學 Past Paper Solution︰ 🤍 DSE 數學 Core 天書 D 的內容︰ 🤍 1 Concept of Probability 概率的概念 2 Application of Probability 概率的應用 3 Factorials, Permutation (nPr), Combination (nCr) 階乘、排列、組合 4 Application of Factorials, nPr, nCr 階乘, nPr, nCr 的應用 5 Statistics 統計學 訂購表格及方法︰ 🤍 Herman Yeung HKDSE Maths 數學 Core 課程： 超過 100 小時 YouTube 免費課程 共 12 本天書完成整個 HKDSE 數學 Core (中一至中六) 要考的所有課題， 適合任何考 HKDSE 的同學上課 (中四至中六都合適) (p.s. Herman Yeung 所有天書，中英對照) 全港 最多 觀看次數 的 HKDSE 學習平台 ~ 打破舊有教育模式，增加 DSE 學習效率 !
This video tackles Q26 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q26。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 0:18] Intro [0:19 - 1:56] Solving 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Equation_Of_Straight_Lines
HKDSE Maths 數學天書 訂購詳情︰🤍 DSE Maths 數學 Past Paper Solution (e-Book)︰ 🤍 DSE Maths 數學 Past Paper Solution︰ 🤍 DSE 數學 Core 天書 C 的內容︰ 🤍 1 Coordinate Systems 坐標系統 2 Polar Coordinates 極坐標 3 Straight Lines 直線 4 Equations of Circles 圓形方程 5 Locus 軌跡 6 Transformation & Symmetry 變換及對稱 訂購表格及方法︰ 🤍 Herman Yeung HKDSE Maths 數學 Core 課程： 超過 100 小時 YouTube 免費課程 共 12 本天書完成整個 HKDSE 數學 Core (中一至中六) 要考的所有課題， 適合任何考 HKDSE 的同學上課 (中四至中六都合適) (p.s. Herman Yeung 所有天書，中英對照) 全港 最多 觀看次數 的 HKDSE 學習平台 ~ 打破舊有教育模式，增加 DSE 學習效率 !
This video tackles Q43 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q43。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 2:56] Solving 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Probability
HKDSE Maths 數學天書 訂購詳情︰🤍 DSE Maths 數學 Past Paper Solution (e-Book)︰ 🤍 DSE Maths 數學 Past Paper Solution︰ 🤍 DSE 數學 Core 天書 F 的內容︰ 🤍 1 Properties of Circles 圓的特性 2 Identity & Formula 恆等式及公式 3 Polynomials 多項式 4 More about Equations 續方程 訂購表格及方法︰ 🤍 Herman Yeung HKDSE Maths 數學 Core 課程： 超過 100 小時 YouTube 免費課程 共 12 本天書完成整個 HKDSE 數學 Core (中一至中六) 要考的所有課題， 適合任何考 HKDSE 的同學上課 (中四至中六都合適) (p.s. Herman Yeung 所有天書，中英對照) 全港 最多 觀看次數 的 HKDSE 學習平台 ~ 打破舊有教育模式，增加 DSE 學習效率 !
This video tackles Q36 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q36。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 1:21] Be careful! Traps ahead. [1:22 - 1:43] Solving (statement 1) [1:44 - 1:53] Exam skill [1:54 - 2:46] Solving (statement 3) [2:47 - 3:37] Explanation on the trap [3:38 - 4:20] Solving (statement 2) 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Geometric_sequence
This video tackles Q3 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q3。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 0:14] Intro [0:15 - 0:43] Solving (method 1 - straight forward) [0:44 - 1:43] Solving (method 2 - quicker) [1:44 - 2:49] Something to notice for method 2 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Expansion
HKDSE Maths 數學天書 訂購詳情︰🤍 DSE Maths 數學 Past Paper Solution (e-Book)︰ 🤍 DSE Maths 數學 Past Paper Solution︰ 🤍 DSE 數學 Core 天書 D 的內容︰ 🤍 1 Concept of Probability 概率的概念 2 Application of Probability 概率的應用 3 Factorials, Permutation (nPr), Combination (nCr) 階乘、排列、組合 4 Application of Factorials, nPr, nCr 階乘, nPr, nCr 的應用 5 Statistics 統計學 訂購表格及方法︰ 🤍 Herman Yeung HKDSE Maths 數學 Core 課程： 超過 100 小時 YouTube 免費課程 共 12 本天書完成整個 HKDSE 數學 Core (中一至中六) 要考的所有課題， 適合任何考 HKDSE 的同學上課 (中四至中六都合適) (p.s. Herman Yeung 所有天書，中英對照) 全港 最多 觀看次數 的 HKDSE 學習平台 ~ 打破舊有教育模式，增加 DSE 學習效率 !
This video tackles Q41 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q41。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 0:12] Intro [0:13 - 0:33] Sketch the situation [0:34 - 1:05] Revision on orthocentre and altitude [1:06 - 3:46] Solving 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Orthocentre
This video tackles Q38 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q38。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 0:40] Intro [0:41 - 1:16] Mark information on the diagram [1:17 - 3:19] My very first attempt (Failed!) [3:20 - 6:25] Solving (It works!) 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Trigonometry
Part (a): (0:00) Part (b): (3:23)
This video tackles Q42 of 2021 DSE Math CP Paper 2. Detailed steps were given with explanation. Related background knowledge was briefly introduced too. Hope this playlist helps. 呢條片主要詳細講解 2021 DSE Math CP Paper 2 Q42。同題目相關嘅重要概念都有喺影片入面講解。希望幫到大家。 🎥 影片流程 Time stamps： [0:00 - 1:01] Solving (Planning) [1:02 - 3:26] Solving (method 1 - at least 4 students) [3:27 - 4:16] Solving (method 2 - (no restriction - at most 4 students)) 📝Used app in the video: Explain Everything If you have any questions regarding this video (including: if you have found any mistakes of mine), please feel free to tell me and discuss with me through the comment section below. 如果對影片有任何疑問（甚至發現我講錯/打錯），歡迎喺下面留言話俾我知😊 香港學生、DSE fighters加油。💪🏻 #2021DSE #Math #Paper2 #Combination
.svg){kind=small}
![[DSE數學]nPr、nCr，10分鐘清concept，必睇!](https://i.ytimg.com/vi/0YrAXYs2WAU/mqdefault.jpg "[DSE數學]nPr、nCr，10分鐘清concept，必睇!")
![[2021 DSE] Math CP Paper 2 Q34 答題詳解 | Solution guide (Logarithmic Transformation)](https://i.ytimg.com/vi/ekuXxx2-4Wc/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q34 答題詳解 | Solution guide (Logarithmic Transformation)")
![[2021 DSE] Math CP Paper 2 Q31 答題詳解 | Solution guide (HCF and LCM)](https://i.ytimg.com/vi/JtGPGuViX6I/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q31 答題詳解 | Solution guide (HCF and LCM)")
![[2021 DSE] Math CP Paper 2 Q5 答題詳解 | Solution guide (Approximation)](https://i.ytimg.com/vi/rqoNgJvCHok/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q5 答題詳解 | Solution guide (Approximation)")
![[2021 DSE] Math CP Paper 2 Q18 答題詳解 | Solution guide (Plane Geometry)](https://i.ytimg.com/vi/nwBUYZqB8Ug/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q18 答題詳解 | Solution guide (Plane Geometry)")
![[2021 DSE] Math CP Paper 2 Q1 答題詳解 | Solution guide (Index Law)](https://i.ytimg.com/vi/-VHiJGSk8Jo/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q1 答題詳解 | Solution guide (Index Law)")
![[2021 DSE] Math CP Paper 2 Q10 答題詳解 | Solution guide (Inequalities)](https://i.ytimg.com/vi/EfbYlOaUT_Q/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q10 答題詳解 | Solution guide (Inequalities)")
![[2021 DSE] Math CP Paper 2 Q40 答題詳解 | Solution guide (Equation of circle)](https://i.ytimg.com/vi/koambXadzCo/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q40 答題詳解 | Solution guide (Equation of circle)")
![[2021 DSE] Math CP Paper 2 Q26 答題詳解 | Solution guide (Equation of Straight Lines)](https://i.ytimg.com/vi/GiHE5JwdVLc/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q26 答題詳解 | Solution guide (Equation of Straight Lines)")
![[2021 DSE] Math CP Paper 2 Q43 答題詳解 | Solution guide (Probability)](https://i.ytimg.com/vi/-XjyTjwRui8/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q43 答題詳解 | Solution guide (Probability)")
![[2021 DSE] Math CP Paper 2 Q36 答題詳解 | Solution guide (Geometric Sequence)](https://i.ytimg.com/vi/hmM-79aUI8Y/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q36 答題詳解 | Solution guide (Geometric Sequence)")
![[2021 DSE] Math CP Paper 2 Q3 答題詳解 | Solution guide (Expansion)](https://i.ytimg.com/vi/BGINjQ1wA3w/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q3 答題詳解 | Solution guide (Expansion)")
![[2021 DSE] Math CP Paper 2 Q41 答題詳解 | Solution guide (Centres of Triangles)](https://i.ytimg.com/vi/jGyB-HhztCU/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q41 答題詳解 | Solution guide (Centres of Triangles)")
![[2021 DSE] Math CP Paper 2 Q38 答題詳解 | Solution guide (More about Trigonometry)](https://i.ytimg.com/vi/5tlLdSFsWrY/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q38 答題詳解 | Solution guide (More about Trigonometry)")
![[2021 DSE] Math CP Paper 2 Q42 答題詳解 | Solution guide (Combination)](https://i.ytimg.com/vi/-hYTqmocghg/mqdefault.jpg "[2021 DSE] Math CP Paper 2 Q42 答題詳解 | Solution guide (Combination)")