Question

Combinatorics problem - No replacement

score 46 · Answer 1 · 2018-08-18 20:15:48

46

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Combinatorics problem - No replacement

Published on 18 Aug 2018 - 20:15

score 63 · Answer 2 · 2026-02-22 23:12:15

63

Views

The expected value of $C$ is equal to $\frac{a}{b}$ for coprime positive integers $a$ and $b.$ What is $a+b?$

Published on 22 Feb 2026 - 23:12

score 81 · Answer 3 · 2018-08-19 03:16:09

81

Views

Prove that $b_\infty(x) = \sum_{i=0}^{\infty} x(i) \cdot 2^i$ is a bijection.

Published on 19 Aug 2018 - 3:16

score 674 · Answer 4 · 2026-04-07 04:46:20

674

Views

Z transform of real-time input to discrete transfer function

Published on 07 Apr 2026 - 4:46

score 564 · Answer 5 · 2026-03-26 04:32:34

564

Views

Expressing the truth set of x≤0

Published on 26 Mar 2026 - 4:32

score 45 · Answer 6 · 2018-08-19 11:55:02

45

Views

For the negation of statement

Published on 19 Aug 2018 - 11:55

score 152 · Answer 7 · 2018-08-19 12:33:13

152

Views

About determining whether the statements are true or false

Published on 19 Aug 2018 - 12:33

score 171 · Answer 8 · 2026-03-25 01:16:47

171

Views

Surface Area of the solid by revolution of a logarithm function around $y$-axis?

Published on 25 Mar 2026 - 1:16

score 128 · Answer 9 · 2026-03-27 04:38:25

128

Views

Complex Fourier series of $ f=|2t|$ in domain $[-1,1]$

Published on 27 Mar 2026 - 4:38

score 135 · Answer 10 · 2018-08-19 21:16:57

135

Views

Is there a bijection $\big\{x:\mathbb{N}\to\{0,1\}:\{i\in\mathbb{N}:x(i)=1\}\text{ is finite}\big\}\to\big\{x:\mathbb{N}\to\{0,1\}\big\}$?

Published on 19 Aug 2018 - 21:16

score 37 · Answer 11 · 2018-08-20 00:06:46

37

Views

About a little different negation of statement

Published on 20 Aug 2018 - 0:06

score 59 · Answer 12 · 2018-08-20 00:27:39

59

Views

About prove this statement is true or false

Published on 20 Aug 2018 - 0:27

score 50 · Answer 13 · 2018-08-20 03:56:25

50

Views

Examples of functions that are 1-1 and onto

Published on 20 Aug 2018 - 3:56

score 233 · Answer 14 · 2026-03-27 02:40:25

233

Views

We are given 10 red and 15 green balls. we are asked to draw two balls successively. What is the probability that one ball is red and other is green.

Published on 27 Mar 2026 - 2:40

score 82 · Answer 15 · 2018-08-20 11:17:48

82

Views

Derive the following identity $1^2+2^2+ \ldots + n^2 = \frac{n(n+1)(2n+1)}{6}$.

Published on 20 Aug 2018 - 11:17

List Question

Combinatorics problem - No replacement

The expected value of $C$ is equal to $\frac{a}{b}$ for coprime positive integers $a$ and $b.$ What is $a+b?$

Prove that $b_\infty(x) = \sum_{i=0}^{\infty} x(i) \cdot 2^i$ is a bijection.

Z transform of real-time input to discrete transfer function

Expressing the truth set of x≤0

For the negation of statement

About determining whether the statements are true or false

Surface Area of the solid by revolution of a logarithm function around $y$-axis?

Complex Fourier series of $ f=|2t|$ in domain $[-1,1]$

Is there a bijection $\big\{x:\mathbb{N}\to\{0,1\}:\{i\in\mathbb{N}:x(i)=1\}\text{ is finite}\big\}\to\big\{x:\mathbb{N}\to\{0,1\}\big\}$?

About a little different negation of statement

About prove this statement is true or false

Examples of functions that are 1-1 and onto

We are given 10 red and 15 green balls. we are asked to draw two balls successively. What is the probability that one ball is red and other is green.

Derive the following identity $1^2+2^2+ \ldots + n^2 = \frac{n(n+1)(2n+1)}{6}$.

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