If nC12 = nC5, find the value of n.
We know that if , then one of the following conditions need to be satisfied:
i. p = q
ii. n = p + q
From the problem we can say that,
⇒ 12≠5
So, the condition(ii) must be satisfied,
⇒ n = 12 + 5
⇒ n = 17.
∴ The value of n is 17.