VelvetThunder
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### Questions (350)

 37 How does the divisibility graphs work? 30 A pencil approach to find $\sum \limits_{i=1}^{69} \sqrt{\left( 1+\frac{1}{i^2}+\frac{1}{(i+1)^2}\right)}$ 30 Checking if a number is a Fibonacci or not? 27 Proving : $\bigl(1+\frac{1}{n+1}\bigr)^{n+1} \gt (1+\frac{1}{n})^{n}$ 23 How can we sum up $\sin$ and $\cos$ series when the angles are in arithmetic progression?

### Reputation (9,507)

 -2 Multiple-choice question about the probability of a random answer to itself being correct +5 How to prove this binomial identity $\sum_{r=0}^n {r {n \choose r}} = n2^{n-1}$? +5 Puzzle - gloves in a closet, three colors +5 Angle between chord and tangent

 32 How many ways are there for 8 men and 5 women to stand in a line so that no two women stand next to each other? 23 Free online mathematical software 20 Online tool for making graphs (vertices and edges)? 15 Number of permutations of $n$ where no number $i$ is in position $i$ 10 How to convert $\sqrt{\frac{5}{3}}$ to $\frac{\sqrt{15}}{3}$?

### Tags (111)

 101 combinatorics × 107 23 big-list × 2 61 algebra-precalculus × 150 23 experimental-mathematics 54 permutations × 7 20 graph-theory × 5 43 math-software × 4 20 online-resources × 2 24 elementary-number-theory × 62 19 faq × 3

### Accounts (18)

 Mathematics 9,507 rep 543118 Programming Puzzles & Code Golf 1,270 rep 518 Stack Overflow 1,038 rep 21539 English Language & Usage 382 rep 4719 Area 51 151 rep 3