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If the coefficient of x^(5) in the expan...

If the coefficient of `x^(5)` in the expansion of `(ax^(2)+(1)/(bx))^(13)` is equal to the coefficient of `x^(-5)` in the expansion of `(ax-(1)/(bx^(2)))^(13)`, then ab =

A

-1

B

`(1)/(6)`

C

`(7)/(6)`

D

`(4)/(2)`

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The correct Answer is:
A
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