List questions from discrete-mathematics

Published on 14 Apr 2026 - 21:38

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Proving the interval $(0, 1)$ and $(1, 3)$ have the same cardinality.

Published on 16 Apr 2026 - 9:17

171

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Why is my proof for “if $0 \leqslant x \leqslant 2$, then $-x^3 + 4x + 1 > 0$” is false?

Published on 15 Apr 2026 - 1:14

59

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How many ways can 50 numbers sum up to 9 million (0 inclusive)

Published on 12 Apr 2026 - 6:01

72

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Permutation probability

Published on 09 Apr 2026 - 8:49

221

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Solving recurrence $X_n = 4X_{n-1}+5$

Published on 15 Apr 2026 - 19:43

98

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Combinatorial Circuit

Published on 13 Apr 2026 - 14:57

234

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Arranging 3 girls and 9 boys

Published on 14 Apr 2026 - 5:19

196

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Find the point of tangency between a plane and an ellipsoid

Published on 12 Apr 2026 - 14:26

2.3k

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Number of isomorphisms between two graphs

Published on 16 Apr 2026 - 13:50

78

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Proof by Contradiction to Prove Theorem that is not True

Published on 12 Apr 2026 - 12:25

63

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Need help solving proof involving equivalence relation

Published on 09 Apr 2026 - 16:13

92

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Find combination given expectation and variance

Published on 15 Apr 2026 - 8:19

209

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Discrete mathematics: Question about finite automata

Published on 12 Apr 2026 - 15:04

726

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Solve linear congruences

Published on 01 Apr 2026 - 5:53

List Question

Inductive proof for $3x+5y=n$ for $n\geq8$

Proving the interval $(0, 1)$ and $(1, 3)$ have the same cardinality.

Why is my proof for “if $0 \leqslant x \leqslant 2$, then $-x^3 + 4x + 1 > 0$” is false?

How many ways can 50 numbers sum up to 9 million (0 inclusive)

Permutation probability

Solving recurrence $X_n = 4X_{n-1}+5$

Combinatorial Circuit

Arranging 3 girls and 9 boys

Find the point of tangency between a plane and an ellipsoid

Number of isomorphisms between two graphs

Proof by Contradiction to Prove Theorem that is not True

Need help solving proof involving equivalence relation

Find combination given expectation and variance

Discrete mathematics: Question about finite automata

Solve linear congruences

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