Find the coefficient of x^(7) in the ex...

Find the coefficient of ` x^(7)` in the expansion of `(ax^(2) + (1)/(bx))^(11)` . (ii) the coefficient of ` x^(-7)` in the expansion of `(ax + (1)/(bx^2))^(11)` . Also , find the relation between a and b , so that these coefficients are equal .

A

`ab=1`

B

`ab=2`

C

`a^(2)b=1`

D

`ab^(2)=2`

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The correct Answer is:

A

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