# Jean-Sébastien

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 Oct6 comment How can we directly see that the number of random walks starting and ending at the origin is ${n\choose n/2}^2$? @IanMateus I've changed it quite a bit, I think the problem in my last one was that I forgot to consider the walks that were made of say more NS than EW. Oct6 revised How can we directly see that the number of random walks starting and ending at the origin is ${n\choose n/2}^2$? added 220 characters in body Oct5 answered How can we directly see that the number of random walks starting and ending at the origin is ${n\choose n/2}^2$? Oct5 reviewed Approve suggested edit on General Exponential modular equation Oct5 reviewed Approve suggested edit on Sampling Distribution/Probability Oct5 reviewed No Action Needed Clarification regarding the monotone convergence theorem Oct5 reviewed No Action Needed Probability of voting in a group of four Oct5 reviewed No Action Needed Need Help with Interpreting this Answer Oct3 answered Can the limit of a product exist if neither of its factors exist? Oct3 comment Puzzle about voting Well if there is only $1$, everybody will always have the same output, so you won't be able to determine the leader. Oct3 comment Puzzle about voting $L$ should also be greater than $1$ I guess Oct3 comment Calculating limits of trigonometric functions analytically $\sin(x)/x$ converges to $1$ as $x$ goes to $0$. Oct3 comment Calculating limits of trigonometric functions analytically I'm also confused, since the example given is wrong. Also, you have a typo, $t_n/s_n$ converges to $t/s$, provided $s\neq 0$. Oct2 comment showing that this integral is divergent Intuition sometimes Oct2 reviewed No Action Needed Calculating the determinant of matrix. Oct2 reviewed No Action Needed verifying the strict inclusions Oct2 reviewed No Action Needed Intuitive/direct proof that a rectangle partitioned into rectangles each with at least one integer side must itself have an integer side Oct2 reviewed Approve suggested edit on probability density Oct1 comment Proving that $n^2 + n$ is even for any integer $n$ I like how long this took compare to the suppose and expand method Oct1 comment Intuition in Rudin's Proof on Page 2 See if this helps math.stackexchange.com/questions/141774/…