List questions from problem-solving

Published on 10 Apr 2026 - 22:47

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Solving 2 equations with 2 unknowns

Published on 13 Jul 2017 - 15:57

60

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Spread X amount of points among Y amount of points

Published on 10 Apr 2026 - 19:20

329

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How many solutions are there to the equation $x_1 + x_2 + x_3 + x_4 \leq 35$ in which all the $x_i$ are non-negative integers?

Published on 13 Jul 2017 - 23:24

366

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Counting the position a subset in lexicographic ordering

Published on 12 Apr 2026 - 4:14

1.4k

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Integral of $e^{x^3+x^2-1}(3x^4+2x^3+2x)$

Published on 14 Jul 2017 - 15:55

68

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Array $A$ of $n$ elements has min, max. Prove that exist $1\le i\le n$,$1\le j\le n$, $i\neq j$ such that $0\le A[i]-A[j]\le \frac{max-min}{n-1}$

Published on 15 Jul 2017 - 13:24

159

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Calculate the limit of $a_{n+1}=\cos\pi a_n$

Published on 30 Mar 2026 - 10:13

231

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Conditional probability: rains on $4^{th}$ day if $1^{st}$ day is a rainy day?

Published on 15 Jul 2017 - 19:02

171

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Mistake in solving $^\infty x=2$ for $x$?

Published on 16 Jul 2017 - 9:32

212

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Proving that $ \sum_{i=1}^{b-1} \left\lfloor \frac{a}{b}i \right\rfloor = \sum_{j=1}^{a-1} \left\lfloor \frac{b}{a}j \right\rfloor $

Published on 03 Apr 2026 - 2:16

201

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Probability expectation example

Published on 11 Apr 2026 - 20:02

378

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How many ball are there in the bag?

Published on 11 Apr 2026 - 0:52

105

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Examples of problems that are easier by knowing eigenvalues/vectors

Published on 28 Mar 2026 - 0:54

299

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Probability Question About Wins in a Season for a Sports Team

Published on 11 Apr 2026 - 1:03

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A Peculiar Function

Solving 2 equations with 2 unknowns

Spread X amount of points among Y amount of points

How many solutions are there to the equation $x_1 + x_2 + x_3 + x_4 \leq 35$ in which all the $x_i$ are non-negative integers?

Counting the position a subset in lexicographic ordering

Integral of $e^{x^3+x^2-1}(3x^4+2x^3+2x)$

Array $A$ of $n$ elements has min, max. Prove that exist $1\le i\le n$,$1\le j\le n$, $i\neq j$ such that $0\le A[i]-A[j]\le \frac{max-min}{n-1}$

Calculate the limit of $a_{n+1}=\cos\pi a_n$

Conditional probability: rains on $4^{th}$ day if $1^{st}$ day is a rainy day?

Mistake in solving $^\infty x=2$ for $x$?

Proving that $ \sum_{i=1}^{b-1} \left\lfloor \frac{a}{b}i \right\rfloor = \sum_{j=1}^{a-1} \left\lfloor \frac{b}{a}j \right\rfloor $

Probability expectation example

How many ball are there in the bag?

Examples of problems that are easier by knowing eigenvalues/vectors

Probability Question About Wins in a Season for a Sports Team

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