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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