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If the coefficient of x^8 in (ax^2+1/(bx...

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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The correct Answer is:
A
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