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If the coefficient of x^7 in (ax-1/(bx^2...

If the coefficient of `x^7` in `(ax-1/(bx^2))^13` and the coefficient of `x^(-5)` in `(ax+1/(bx^2))^13` are equal, then `a^4 b^4` is equal to:

A

44

B

22

C

33

D

11

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