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If the coefficients of a^(r-1),\ a^r and...

If the coefficients of `a^(r-1),\ a^r and \ a^(r+1)` in the binomial expansion of `(1+a)^n` are in A.P., prove that `n^2-n(4r+1)+4r^2-2=0.`

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RD SHARMA ENGLISH-BINOMIAL THEOREM-All Questions
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