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Proof of Gaussian coefficients identity

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#combinatorics #number-theory #binomial-coefficients
256
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Two Recurrences for Counting Rooted Trees

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#combinatorics #integer-partitions
62
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Proving Binomial Identity using PIE

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#combinatorics
443
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Number of ways to split 8 people into groups of 2

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#combinatorics
182
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Number of words of length 2n

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#combinatorics
437
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4 digit number be arranged from 7,2,6,8,5,1 and divisible by 5

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#combinatorics #elementary-number-theory #permutations #combinations
163
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Number of ways to add up $1$s, $0$s and $-1$s to a given number

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#combinatorics #binomial-coefficients
125
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Probability that a bit sequence does not appear in a sequence

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#probability #combinatorics #binomial-distribution #bit-strings
929
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Distribution of sum of iid Categorical Random Variables with outcomes $-1$, $0$ and $1$

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#probability #combinatorics #probability-distributions #multinomial-coefficients
55
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Computing probability of extracting AT LEAST n balls from a urn

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#probability #combinatorics
353
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A Probability Problem About Seating Arrangements

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#probability #combinatorics
283
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Finding the number of unlabeled graphs with $n$ vertices such that each vertex has degree 2

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#combinatorics #graph-theory
83
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4 men and 4 women sitting on 2 rows with 4 seats each

Published on
#combinatorics #permutations
245
Views

How many sequences $a_1, a_2, a_3, a_4, a_5$ satisfying $a_1 < a_2 < a_3 < a_4 < a_5$ can be formed if each $a_i\in\{ 1, 2, 3, …, 9\}$

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#combinatorics #permutations
214
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Diameter of the Symmetric group

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#combinatorics #group-theory #finite-groups #symmetric-groups

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