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If the coefficient of x^(8) in (ax^(2)+...

If the coefficient of `x^(8) ` in `(ax^(2)+(1)/(bx))^(13)` is equal to the coefficient of `x^(-8)` in `(ax-(1)/(bx^(2)))^(13)` then a and b will satisfy the relation

A

`ab+1=0`

B

`ab=1`

C

`a=1-b`

D

`a+b=-1`

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