Question

In how many different ways can we place $8$ identical rooks on a chess board so that no two of them attack each other?

score 40.2k · Answer 1 · 2013-05-03 02:35:30

40.2k

Views

In how many different ways can we place $8$ identical rooks on a chess board so that no two of them attack each other?

Published on 03 May 2013 - 2:35

score 229 · Answer 2 · 2013-05-04 22:26:19

229

Views

Show that one person must have x amount of dollars

Published on 04 May 2013 - 22:26

score 1.5k · Answer 3 · 2026-04-07 16:07:30

1.5k

Views

Problems on submanifolds

Published on 07 Apr 2026 - 16:07

score 74 · Answer 4 · 2026-04-03 04:16:32

74

Views

Non-linear system of 4 unknowns

Published on 03 Apr 2026 - 4:16

score 456 · Answer 5 · 2013-05-16 20:03:50

456

Views

Puzzle identification and solving algorithm

Published on 16 May 2013 - 20:03

score 149 · Answer 6 · 2026-04-03 23:04:06

149

Views

Using the hypothesis $\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=\frac{1}{a+b+c}$ to prove something else

Published on 03 Apr 2026 - 23:04

score 3.1k · Answer 7 · 2013-05-17 16:06:41

3.1k

Views

Comparing $\sqrt{1001}+\sqrt{999}\ , \ 2\sqrt{1000}$

Published on 17 May 2013 - 16:06

score 1.7k · Answer 8 · 2013-05-17 17:17:57

1.7k

Views

Simplify $\log_23\ \log_34\ \log_4 5\ \log_5 6\ \log_6 7\ \log_7 8$

Published on 17 May 2013 - 17:17

score 7.4k · Answer 9 · 2013-05-17 17:23:19

7.4k

Views

Solving $x^{\log(x)}=\frac{x^3}{100}$

Published on 17 May 2013 - 17:23

score 177 · Answer 10 · 2013-05-18 05:59:10

177

Views

Power series of $f(x)=\sqrt{\frac{1+x}{1-x}}$

Published on 18 May 2013 - 5:59

score 152 · Answer 11 · 2026-04-04 06:58:55

152

Views

Simplifying $\left|\left|\sqrt{-x^2}-1\right|-2\right|$

Published on 04 Apr 2026 - 6:58

score 202 · Answer 12 · 2013-05-19 00:19:21

202

Views

Simplifying $\sqrt{\underbrace{11\dots1}_{2n\ 1's}-\underbrace{22\dots2}_{n\ 2's}}$

Published on 19 May 2013 - 0:19

score 291 · Answer 13 · 2013-05-19 00:39:54

291

Views

Proving that $\frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+\dots+\frac{1}{\sqrt{100}}<20$

Published on 19 May 2013 - 0:39

score 46 · Answer 14 · 2013-05-19 07:37:02

46

Views

Creating simultaneous non-linear equations

Published on 19 May 2013 - 7:37

score 189 · Answer 15 · 2013-05-19 11:50:59

189

Views

Why substitution method does not work for $\int (x-\frac{1}{2x} )^2\, \mathrm dx$?

Published on 19 May 2013 - 11:50

List Question

In how many different ways can we place $8$ identical rooks on a chess board so that no two of them attack each other?

Show that one person must have x amount of dollars

Problems on submanifolds

Non-linear system of 4 unknowns

Puzzle identification and solving algorithm

Using the hypothesis $\frac{1}{a}+\frac{1}{b}+\frac{1}{c}=\frac{1}{a+b+c}$ to prove something else

Comparing $\sqrt{1001}+\sqrt{999}\ , \ 2\sqrt{1000}$

Simplify $\log_23\ \log_34\ \log_4 5\ \log_5 6\ \log_6 7\ \log_7 8$

Solving $x^{\log(x)}=\frac{x^3}{100}$

Power series of $f(x)=\sqrt{\frac{1+x}{1-x}}$

Simplifying $\left|\left|\sqrt{-x^2}-1\right|-2\right|$

Simplifying $\sqrt{\underbrace{11\dots1}_{2n\ 1's}-\underbrace{22\dots2}_{n\ 2's}}$

Proving that $\frac{1}{\sqrt{1}}+\frac{1}{\sqrt{2}}+\dots+\frac{1}{\sqrt{100}}<20$

Creating simultaneous non-linear equations

Why substitution method does not work for $\int (x-\frac{1}{2x} )^2\, \mathrm dx$?

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