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Show that the middle term in the expansi...

Show that the middle term in the expansion of `(x+1)^(2n)` is `(1.3.5.....(2n-1))/(n!) 2^n.x^n`.

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UNITED BOOK HOUSE-ANNUAL EXAMINATION QUESTION PAPERS 2015-EXERCISE
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  2. If y=x+x^2+x^3+...oowhere|x|<1,prove that x=y/(1+y)

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