Q.

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

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a

5n−4

b

6n−5

c

n−56

d

n−45

answer is D.

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Detailed Solution

Given T5+T6=0⇒C4   nan-4 b4-c5   nan-5 b5=0 ⇒C4   nan-4 b4=c5   nan-5 b5 ⇒an-4 b4an-5 b5=c5   nC4   n ⇒ab=n-5+15=n-45
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In the binomial expansion of (a-b)n,n≥5, the sum of 5th and 6th  terms is zero then a/b equal to