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

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

`a-b=1`

B

`a+b=1`

C

`(a)/(b)=1`

D

`ab=1`

Text Solution

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The correct Answer is:
D
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