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Prove that the coefficient of the middle...

Prove that the coefficient of the middle term in the expansion of `(1+x)^(2n)` is equal to the sum of the coefficients of middle terms in the expansion of `(1+x)^(2n-1)`

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  13. If the coefficients of (r-5)^(t h) and (2r-1)^(t h) terms in the expan...

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