Let t(n ) denote the nth term in a binom...

Let `t_(n )` denote the `n`th term in a binomial expansion. If `(t_6)/( t_5)` in the expansion of `(a+b)^(n+4)` and `(t_5)/(t_4)` in the expansion of `(a+b)^(n)` are equal, then `n` is equal to
a)9 b)11 c)13 d)15

A

9

B

11

C

13

D

15

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The correct Answer is:

D

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