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If the coefficient of x^7 in (ax^2+(1)/(...

If the coefficient of `x^7` in `(ax^2+(1)/(bx))^11` equals the coefficient of `x^-7` in `(ax-(1)/(bx^2))^11`, then a and b satisfy the relation

A

ab = 1

B

a/b = 1

C

a + b = 1

D

a - b = 1

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The correct Answer is:
A
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