If the coefficients of the 2nd, 3rd and 4th terms in the expansion of (1+x)^n, n N , are in AP then n is

JEE Advanced Mathematics question

If the coefficients of the 2nd, 3rd and 4th terms in the expansion of , , are in AP then is

Answer: (A)

The coefficients are (so we need for a 4th term to exist). AP condition :

n(n-1)=n+ ⇒ 6(n-

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Question ID VK-108317