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Find the coefficients of x^7 in (a x^2+1...

Find the coefficients of `x^7` in `(a x^2+1/(b x))^(11)and x^(-7)i n(a x-1/(b x^2))^(11)` and find the relation between `a and b` so that coefficients are equal.

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RD SHARMA ENGLISH-BINOMIAL THEOREM-All Questions
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