Binomial TheoremHard

Question

The sum of the co-efficients in the expansion of (1 - 2x + 5x2)n is ′a′ and the sum of the co-efficients in the expansion of (1 + x)2n is b. Then -

Options

A.a = b
B.a = b2
C.a2 = b
D.ab = 1

Solution

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