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If the 7th and 8th term of the binomial ...

If the 7th and 8th term of the binomial expansion `(2a - 3b)^(n)` are equal, then `(2a +3b)/(2a-3b)` is equal to a)`(13-n)/-(n+1)` b)`(n+1)/(13-n)` c)`(6-n)/(13-n)` d)`(n-1)/(13-n)`

A

`(13-n)/(n+1)`

B

`(n+1)/(13-n)`

C

`(6-n)/(13-n)`

D

`(n-1)/(13-n)`

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