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If a\ a n d\ b are the coefficients of x...

If `a\ a n d\ b` are the coefficients of `x^n` in the expansions of `(1+x)^(2n)` and `(1+x)^(2n-1)` respectively, find `a/b`.

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RD SHARMA ENGLISH-BINOMIAL THEOREM-All Questions
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  17. In the expansion of (x-1/(3x^2))^9, the term independent of x is a. T3...

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