Binomial TheoremHard

Question

The co-efficient of x in the expansion of (1 - 2 x3 + 3 x5) is :

Options

A.56
B.65
C.154
D.62

Solution

(1 - 2x3 + 3x5)
Co-efficient of x = - 2. 8C2 + 3 . 8C4 = 154

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