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 Mar 9 awarded Popular Question Feb 22 comment Let X be a random variable with $E(X^m) = (m+1)!2^m$,m = 1,2,3,… Find the density of X. how to compute the the moment generating function of x? Feb 22 asked Let X be a random variable with $E(X^m) = (m+1)!2^m$,m = 1,2,3,… Find the density of X. Feb 13 comment To prove $\sum_{n=0}^\infty \binom{r}{x}\binom{N-r}{n-x}=\binom{N}{n}.$ soory my bad the limits are from 0 to n and x is varying Feb 13 revised To prove $\sum_{n=0}^\infty \binom{r}{x}\binom{N-r}{n-x}=\binom{N}{n}.$ edited body Feb 13 asked To prove $\sum_{n=0}^\infty \binom{r}{x}\binom{N-r}{n-x}=\binom{N}{n}.$ Dec 9 awarded Famous Question Dec 5 awarded Popular Question Nov 3 awarded Popular Question Jun 15 awarded Yearling Jun 1 awarded Popular Question Apr 8 revised The maximum value of expression $\sqrt{\sin^2x+ 2a^2} - \sqrt{-1 -\cos^2x+ 2a^2}$ edited body; edited title Apr 8 comment The maximum value of expression $\sqrt{\sin^2x+ 2a^2} - \sqrt{-1 -\cos^2x+ 2a^2}$ yes that square root Apr 8 asked The maximum value of expression $\sqrt{\sin^2x+ 2a^2} - \sqrt{-1 -\cos^2x+ 2a^2}$ Apr 8 asked Find the last three digits of $17^{256}$ Apr 7 accepted How to calculate the coordinates of orthocentre.!! Jan 27 awarded Popular Question Nov 19 accepted Find the possible values of |A + B + C | Nov 18 comment Find the possible values of |A + B + C | anyone???????????? Nov 18 asked Find the possible values of |A + B + C |