Question

Conditional expectation of a component in a multinomial distribution: understanding of complex calculations

score 256 · Answer 1 · 2026-02-23 10:18:46

256

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Conditional expectation of a component in a multinomial distribution: understanding of complex calculations

Published on 23 Feb 2026 - 10:18

score 724 · Answer 2 · 2021-05-21 15:53:09

724

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Is $1/(1/0)$ undefined, or does it equal zero?

Published on 21 May 2021 - 15:53

score 175 · Answer 3 · 2021-05-22 06:28:02

175

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Smallest value of $b$ when $0<\left\lvert \frac{a}{b}-\frac{3}{5}\right\rvert\leq\frac{1}{150}$

Published on 22 May 2021 - 6:28

score 155 · Answer 4 · 2026-03-31 19:43:52

155

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How to setup the correct fraction in word problems?

Published on 31 Mar 2026 - 19:43

score 416 · Answer 5 · 2021-05-24 11:52:53

416

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Find the fraction with smallest denominator between two bounds

Published on 24 May 2021 - 11:52

score 58 · Answer 6 · 2026-04-08 22:14:58

58

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What is the most elegant way to calculate this fraction?

Published on 08 Apr 2026 - 22:14

score 81 · Answer 7 · 2026-03-30 10:39:16

81

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XORing two fractions of integers

Published on 30 Mar 2026 - 10:39

score 52 · Answer 8 · 2021-05-30 15:23:19

Number pairs such that their fraction $\frac{AB}{CD}$ (in decimal representation) is the same as the fraction of sums $\frac{A+B}{C+D}$

score 116 · Answer 9 · 2021-05-30 15:26:51

116

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Why $x$ cannot be zero in $y=\frac{1}{\frac{1}{x}}$

Published on 30 May 2021 - 15:26

score 64 · Answer 10 · 2026-03-28 00:35:27

64

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Why do we consider $\sqrt{x^2}=x$ rather than $|x|$ in solving $xy'=y+2\sqrt{xy}$?

Published on 28 Mar 2026 - 0:35

score 53 · Answer 11 · 2026-04-02 11:11:18

53

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When does the fraction $142/2.54$ ever repeat?

Published on 02 Apr 2026 - 11:11

score 39 · Answer 12 · 2026-03-28 11:33:28

39

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Finding the position percentage of the object in the a similar sized small rectangle

Published on 28 Mar 2026 - 11:33

score 48 · Answer 13 · 2021-06-14 03:38:13

48

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If $x\in\mathbb{R}$ and $y\in\mathbb{R}$ then $\frac xy\in\mathbb{R}$?

Published on 14 Jun 2021 - 3:38

score 92 · Answer 14 · 2021-06-19 17:34:54

92

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Find all integers n having the property that $\frac{2^n+1}{n^2}$ is an integer

Published on 19 Jun 2021 - 17:34

score 81 · Answer 15 · 2021-06-22 03:52:57

81

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How to prove $\frac{\prod_{k=1}^{31}{}\left(1+\frac{29}{k}\right)}{ \prod_{k=1}^{29}\left(1+\frac{31}{k}\right)}=1$

Published on 22 Jun 2021 - 3:52

List Question

Conditional expectation of a component in a multinomial distribution: understanding of complex calculations

Is $1/(1/0)$ undefined, or does it equal zero?

Smallest value of $b$ when $0<\left\lvert \frac{a}{b}-\frac{3}{5}\right\rvert\leq\frac{1}{150}$

How to setup the correct fraction in word problems?

Find the fraction with smallest denominator between two bounds

What is the most elegant way to calculate this fraction?

XORing two fractions of integers

Number pairs such that their fraction $\frac{AB}{CD}$ (in decimal representation) is the same as the fraction of sums $\frac{A+B}{C+D}$

Why $x$ cannot be zero in $y=\frac{1}{\frac{1}{x}}$

Why do we consider $\sqrt{x^2}=x$ rather than $|x|$ in solving $xy'=y+2\sqrt{xy}$?

When does the fraction $142/2.54$ ever repeat?

Finding the position percentage of the object in the a similar sized small rectangle

If $x\in\mathbb{R}$ and $y\in\mathbb{R}$ then $\frac xy\in\mathbb{R}$?

Find all integers n having the property that $\frac{2^n+1}{n^2}$ is an integer

How to prove $\frac{\prod_{k=1}^{31}{}\left(1+\frac{29}{k}\right)}{ \prod_{k=1}^{29}\left(1+\frac{31}{k}\right)}=1$

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