Permutation & Combination · Question 19 · Easy
If nC2 = 36, what is the value of n?
- 6
- 8
- 12
- 9
Answer and explanation
Answer: D. 9
Explanation: n(n − 1)/2 = 36 gives n(n − 1) = 72 = 9 × 8, so n = 9.
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