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:

`(n-5)/(6)`

`(n-4)/(5)`

`(5)/(n-4)`

`(6)/(n-5)`.

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