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 Apr 26 revised Finding out a limit using Taylor series. edited tags Apr 26 revised Finding out a limit using Taylor series. added 3 characters in body Apr 24 revised Why $\displaystyle\sum_{n=1}^\infty {\ln(n^2) \over (n^2) }$ converges? added 12 characters in body Apr 24 revised probability that you get one ace and the rest are face cards if you are dealt with 5 cards from a Standard Deck added 1 character in body Apr 6 revised Probability of at least one triangle in Erdos-Renyi graph added 5 characters in body Mar 26 revised How to solve $\lim_{x\to\infty}(x+2)e^{-\frac{1}{x}}-x$? added 205 characters in body Mar 15 revised How to Solve a Stars and Bars Discrete Math Problem edited body Mar 9 revised Solve the linear recurrence with initial conditions $a_n=a_{n-1}+2^n+1$ and $a_0 =0$ edited title Mar 9 revised Rearrangement of Students (flaw in my solution) added 2 characters in body Mar 9 revised Rearrangement of Students (flaw in my solution) added 149 characters in body Mar 3 revised Naive probability: Counting number of favorable outcomes deleted 40 characters in body Feb 15 revised Closed form of $\sum_{k=1}^{2015}(-1)^{k(k+1)/2}k$ added 6 characters in body Feb 11 revised How to calculate $\sum_{n=1}^{15}n(n!) = ?$ edited body Feb 10 revised Finding closed form expression for a multiple sum. deleted 2 characters in body Feb 4 revised Combinatorial argument for $\sum\limits_{k=i}^{n}\binom{n}{k}\binom{k}{i} = \binom{n}{i}2^{n-i}$ edited tags; edited title Feb 4 revised Possible closed form or approximation? deleted 3 characters in body; edited tags Feb 1 revised why is the limit as n goes to infinity of $(1+\frac{1}{n}+\frac{200}{n^2})^n = e$? added 14 characters in body Feb 1 revised What is sample variance of sample variance, and what is theoretical sampling distribution? added 1 character in body; deleted 1 character in body; edited body; added 1 character in body Jan 25 revised Prove $\sum\limits_{i=1}^{n-k} (-1)^{i+1} \cdot \tfrac{(k-1+i)!}{k! \cdot(i-1)!} \cdot \tfrac{n!}{(k+i)! \cdot (n-k-i)!}=1$ edited body Jan 24 revised Show that $\lim_{n\to\infty}n+n^2 \log\left(\frac{n}{n+1}\right)= 1/2$ edited body