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ithisa

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Top posts (100) All Questions Answers | Votes Newest

23 Proof that the hypergeometric distribution with large $N$ approaches the binomial distribution. Mar 14 '13
15 Combinatorial proof of $\sum^{n}_{i=1}\binom{n}{i}i=n2^{n-1}$. May 11 '13
10 Show that triangle-free planar graphs are four-colorable Jul 28 '13
9 Deducing a probability distribution from its moment-generating function Apr 7 '13
9 Seating of $n$ people with tickets into $n+k$ chairs with 1st person taking a random seat Jan 30 '13
8 Contradiction in the rules regarding determinants and row operations? Mar 21 '13
7 Proving that G contains a cycle with at least $k+1$ edges Jul 1 '13
7 Proving that a “prime graph” is connected Aug 1 '13
6 What's so special about a 2D plane in graph theory? Jul 17 '13
5 Proving that similar matrices have identical ranks Sep 9 '13
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