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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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The correct Answer is:
B
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