List questions from discrete-mathematics

263

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Let x and y be real numbers. Prove that if x≤y+ϵ for every positive real number ϵ, then x≤y. Why do we set ϵ = 1/2(x−y)?

Published on 15 Apr 2026 - 21:27

73

Views

How many strings of length $4$ can be built from letters $a, b, c, d, e$?

Published on 14 Apr 2026 - 11:32

73

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Modulo calculation

Published on 12 Apr 2026 - 18:21

522

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Is the multiplicative group $\Bbb Z_{36}^\times$ cyclic?

Published on 11 Apr 2026 - 23:17

125

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How many permutations of order $8$ in $S_{10}$?

Published on 16 Apr 2026 - 8:09

193

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Sum with Binomial Coefficients to Floor Function

Published on 11 Apr 2026 - 4:42

108

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How to proceed when you have an invalid range in a sum?

Published on 26 Mar 2026 - 5:54

117

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Let $(F_n)_{n\in \mathbb{N}}$ be the Fibonacci sequence. Prove that $F_{n+1}F_n - F_{n-1}F_{n-2} = F_{2n-1}$.

Published on 16 Apr 2026 - 19:43

150

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Find the least value of A+B

Published on 14 Apr 2026 - 12:03

60

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Find the total distinct 4 letter code arrangments

Published on 16 Apr 2026 - 13:14

392

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In Mathematics is there a discrete logarithm function?

Published on 09 Apr 2026 - 7:28

55

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Context-Free grammar - Normal form

Published on 05 Apr 2026 - 20:23

229

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the cardinal number of the set of the relations

Published on 17 Apr 2026 - 9:08

110

Views

Pumping Lemma - unregular expression

Published on 09 Apr 2026 - 18:58

498

Views

Translating a sentence into a predicate formula

Published on 09 Apr 2026 - 3:18

List Question

Let x and y be real numbers. Prove that if x≤y+ϵ for every positive real number ϵ, then x≤y. Why do we set ϵ = 1/2(x−y)?

How many strings of length $4$ can be built from letters $a, b, c, d, e$?

Modulo calculation

Is the multiplicative group $\Bbb Z_{36}^\times$ cyclic?

How many permutations of order $8$ in $S_{10}$?

Sum with Binomial Coefficients to Floor Function

How to proceed when you have an invalid range in a sum?

Let $(F_n)_{n\in \mathbb{N}}$ be the Fibonacci sequence. Prove that $F_{n+1}F_n - F_{n-1}F_{n-2} = F_{2n-1}$.

Find the least value of A+B

Find the total distinct 4 letter code arrangments

In Mathematics is there a discrete logarithm function?

Context-Free grammar - Normal form

the cardinal number of the set of the relations

Pumping Lemma - unregular expression

Translating a sentence into a predicate formula

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