SPM 2018 Add Maths Paper 1, Question 2Permutation & Combination

Solved on video in English and Bahasa Melayu · 2 marks · Form 5, Permutation & Combination · 4:02 video

The question

(a) Given that C(6, n) > 1, list out all the possible values of n. (b) Given that C(y, m) = C(y, n), express y in terms of m and n.

[2 marks]

Step 1

C(6, n) counts the number of ways of choosing n objects from 6, so n must be a whole number from 0 to 6.

5 more steps, each with the reason for it, in the full solution

Final answer

(a) n = 1, 2, 3, 4, 5; (b) y = m + n

Where students lose marks

Watch out: n = 0 and n = 6 give exactly 1, so exclude them. In (b), use C(y, r) = C(y, y − r).

Watch every step of this question solved on video (4:02), with the reason behind each step and a box that checks your own answer.

No card. Every past-year question on video, in English and BM.

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