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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 .

Text Solution

Verified by Experts

The correct Answer is:
`ab=1" "( :. .^(11)C_(5) = .^(11)C_(6))`
Which is a required relation between a and b.
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