Binomial TheoremHard

Question

In the binomial expansion of (a - b)n, n ≥ 5, the sum of 5th and 6th terms is zero, then equals

Options

A.
B.
C.
D.

Solution

nC4an-4(-b)4 + nC5 an-5(-b)5 = 0
⇒    

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