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

In the binomial expansion of `(a -b)^n, nge5`, the sum of the 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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