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If the coefficient of x^(7) " in " (ax^...

If the coefficient of ` x^(7) " in " (ax^(2) + (1)/(bx))^(11)` is equal to the
coefficient of ` x^(-7) " in " (ax - (1)/(bx^(2)))` , then ab is equal to

A

a+b=1

B

a-b=1

C

ab=1

D

`a/b=1`.

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