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

In the binomial expansion of `(a-b)^n , ngeq5,` the sum of 5th and 6th terms is zero, then `a/b` equals (1) `5/(n-4)` (2) `6/(n-5)` (3) `(n-5)/6` (4) `(n-4)/5`

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