If n is odd then the greatest coefficient occurs in the expansion of (x+y)n are

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nCn−12 nCn+12

nC2,nC1

n+1C2n+1C1

n+1C2n−1C2

answer is A.

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Detailed Solution

When n is odd, there are two middle terms having greatest binomial coefficients given by Cn-12 n,Cn+12 n