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 Sep24 awarded Autobiographer Feb21 answered Help proving basic group properties Feb5 comment Examples of Talagrand's inequality math.ucla.edu/~nickcook/talagrand.pdf This link may help. Feb3 comment How many triangle can be drawn with those points? As the different distribution of the points may result some very different answers. You need to add the condition here. Dec13 revised Find the value of c improved formatting Dec13 suggested approved edit on Find the value of c Dec12 awarded Organizer Dec12 revised When is $|f(x)|$ equivalent to $f(|x|)$ Improved formatting. Dec12 suggested approved edit on When is $|f(x)|$ equivalent to $f(|x|)$ Dec12 awarded Supporter Dec12 comment Random sampling of 100 data points from a binomial population I have changed the data. Dec12 awarded Editor Dec12 revised Random sampling of 100 data points from a binomial population added 3 characters in body Dec12 comment Random sampling of 100 data points from a binomial population You said 40 is the mean..so let me redo again. 40 should be the number of trial. Dec12 answered Random sampling of 100 data points from a binomial population Dec12 comment Uniform convergence of $\sum\limits_{n=1}^\infty \frac{(-1)^n}{ne^{nx}}$ Maybe you can try to use the ratio test. Similar question: link Dec11 comment Polynomial With Imaginary Roots You are in the right track. The complex roots always come as conjugated. Thus the equation will actually have 4 roots. Then you can rewrite into $(x-a)(x-b)(x-c)(x-d)=0$ form, and you will have your answer. Dec10 answered Proving that $\sum_{k=0}^{\infty}\frac{1}{(k+1)(2k+1)(4k+1)}=\frac{\pi}{3}$ Dec10 awarded Teacher Dec10 answered How prove this inequality $\sin{\sin{\sin{\sin{x}}}}\le\frac{4}{5}\cos{\cos{\cos{\cos{x}}}}$