Question

Given $n_1 \ge d_1 \ge 0$, $n_2 \ge d_2 \ge 0$ and $d_1 + d_2 \gt 0$, how do I show that...

score 31 · Answer 1 · 2018-11-18 09:43:13

31

Views

Given $n_1 \ge d_1 \ge 0$, $n_2 \ge d_2 \ge 0$ and $d_1 + d_2 \gt 0$, how do I show that...

Published on 18 Nov 2018 - 9:43

score 868 · Answer 2 · 2026-03-25 06:06:30

868

Views

Number of right angled triangles formed by vertices of a 14-gon

Published on 25 Mar 2026 - 6:06

score 33 · Answer 3 · 2018-11-18 10:31:46

33

Views

proof injective mapping of $A$ with $n$ elements and $B = \{A_1, A_2, ..., A_n\} \subseteq 2^A$

Published on 18 Nov 2018 - 10:31

score 97 · Answer 4 · 2026-04-13 18:22:54

97

Views

Proving that a bijection exists

Published on 13 Apr 2026 - 18:22

score 264 · Answer 5 · 2026-04-13 16:29:23

264

Views

How many ways to pick 11 coins from those five piles of coins which must consists of all five different value of coins

Published on 13 Apr 2026 - 16:29

score 31 · Answer 6 · 2026-03-29 22:26:26

31

Views

Induction help ($a_n \lt 2^n$)

Published on 29 Mar 2026 - 22:26

score 281 · Answer 7 · 2026-04-12 23:32:54

281

Views

The pigeonhole principle - $30$ pens in a drawer

Published on 12 Apr 2026 - 23:32

score 218 · Answer 8 · 2026-03-26 03:13:31

218

Views

$n$ guests, each guest brings a prize, how many ways may the prizes be given out so nobody gets the prize that they brought?

Published on 26 Mar 2026 - 3:13

score 3.2k · Answer 9 · 2026-04-03 18:48:06

3.2k

Views

In any group of 17 people, where each person knows 4 others, you can find 2 people, which don't know each other and have no common friends.

Published on 03 Apr 2026 - 18:48

score 79 · Answer 10 · 2026-04-10 10:04:14

79

Views

Is the given function injective, surjective?

Published on 10 Apr 2026 - 10:04

score 173 · Answer 11 · 2026-03-26 03:13:34

173

Views

Determine the number of integer solutions to $x_1 + x_2 + x_3 + x_4 = 19$, where $−5 \le x_i \le 10$ for all $1 \le i \le 4$

Published on 26 Mar 2026 - 3:13

score 99 · Answer 12 · 2026-04-11 07:09:16

99

Views

Discrete Mathematics - Truth Function Problem

Published on 11 Apr 2026 - 7:09

score 78 · Answer 13 · 2026-04-13 20:25:37

78

Views

graph theory and linear algebra

Published on 13 Apr 2026 - 20:25

score 100 · Answer 14 · 2026-04-13 02:26:53

100

Views

Proving 2 languages are equal.

Published on 13 Apr 2026 - 2:26

score 47 · Answer 15 · 2026-04-10 05:34:07

47

Views

Calculating no. of solutions within some bounds

Published on 10 Apr 2026 - 5:34

List Question

Given $n_1 \ge d_1 \ge 0$, $n_2 \ge d_2 \ge 0$ and $d_1 + d_2 \gt 0$, how do I show that...

Number of right angled triangles formed by vertices of a 14-gon

proof injective mapping of $A$ with $n$ elements and $B = \{A_1, A_2, ..., A_n\} \subseteq 2^A$

Proving that a bijection exists

How many ways to pick 11 coins from those five piles of coins which must consists of all five different value of coins

Induction help ($a_n \lt 2^n$)

The pigeonhole principle - $30$ pens in a drawer

$n$ guests, each guest brings a prize, how many ways may the prizes be given out so nobody gets the prize that they brought?

In any group of 17 people, where each person knows 4 others, you can find 2 people, which don't know each other and have no common friends.

Is the given function injective, surjective?

Determine the number of integer solutions to $x_1 + x_2 + x_3 + x_4 = 19$, where $−5 \le x_i \le 10$ for all $1 \le i \le 4$

Discrete Mathematics - Truth Function Problem

graph theory and linear algebra

Proving 2 languages are equal.

Calculating no. of solutions within some bounds

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