code_hacker

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9 Questions

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16	How to solve $\binom{n}{1}^2+2\binom{n}{2}^2 + 3\binom{n}{3}^2 + 4\binom{n}{4}^2+\cdots + n\binom{n}{n}^2$?
15	Finding when $(a-n)(b-n)\|(ab-n)$
4	How to improve mathematics for Programming Contests?
1	No. of solutions of equation?
1	Another Trigonometry problem, sum of products of sine function over partitions of N

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303 Reputation

+68	How to solve $\binom{n}{1}^2+2\binom{n}{2}^2 + 3\binom{n}{3}^2 + 4\binom{n}{4}^2+\cdots + n\binom{n}{n}^2$?
-2	A variation of no of triplets(a,b,c) such that a,b,c are in AP
+10	How to improve mathematics for Programming Contests?
+5	Another Trigonometry problem, sum of products of sine function over partitions of N

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11 Tags

0 linear-algebra × 5	0 prime-numbers
0 combinatorics × 4	0 binomial-coefficients
0 contest-math × 2	0 diophantine-equations
0 soft-question	0 spoj
0 self-learning	0 elementary-number-theory

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$Mathematics Stack Exchange$	Mathematics	303 rep	19
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