In the binomial expansion of (a-b)^(n),n...

In the binomial expansion of `(a-b)^(n),nge5,` the sum of 5th and 6th terms is zero then `a/b` equals:

A

`(n-5)/6`

B

`(n-4)/5`

C

`5/(n-4)`

D

`6/(n-5)`

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The correct Answer is:

B

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