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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