Binomial TheoremHard

Question

Let the co-efficients of xn in (1 + x)2n & (1 + x)2n - 1  be P & Q respectively, then =

Options

A.9
B.27
C.81
D.none of these

Solution

P = 2nCn and Q = 2n-1Cn  ⇒  P/Q = 2
= (1 + 2)5 = 35

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