Binomial TheoremHard

Question

Co-efficient of x5 in the expansion of (1 + x2)5 (1 + x)4 is :

Options

A.40
B.50
C.30
D.60

Solution

Co-efficient of x5 in (1 + x2)5 (1 + x)4 = 4C1 . 4C2 + 4C3 . 5C1 = 40 + 20 = 60

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