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On the Catalan Numbers

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#combinatorics #discrete-mathematics #combinatorial-proofs #catalan-numbers
332
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Unique Partitions of Combinations

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#combinatorics
943
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Generating function for number of graphs with all vertices of degree 1 or 2

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#combinatorics #graph-theory #generating-functions
57
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How to parse mathematical notation for this combinatorial problem?

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#combinatorics #combinatorics-on-words
262
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Combinatorics with ordering significance

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#combinatorics #permutations
507
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Conditional probability of a Royal flush

Published on
#probability #combinatorics
143
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Count of $N$ digit numbers with no repeating neighbors

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#combinatorics #combinations
67
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how many 4 digits passwords contains 2 same digits in a row

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#combinatorics
1.2k
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NON-martingale approach to ABRACADABRA problem

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#probability #combinatorics #martingales #expected-value #pattern-matching
1.8k
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How many 5 digit numbers are there, whose i digit is divisible by i?

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#combinatorics
85
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Possibilities to place $20$ different persons onto $25$ seats

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#combinatorics #permutations
41
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Count of subsets, that consist of 4 elements where the sum is even

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#combinatorics
161
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$(2n-1)(2n-3)\cdots 3\cdot1 = \frac{(2n)!}{2^nn!}$

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#combinatorics #elementary-number-theory #binomial-coefficients #combinations
1.4k
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There are 3 sections in a question paper with 5 questions each.

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#combinatorics #permutations
280
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Symmetric function on set of size four

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#combinatorics #functions #elementary-set-theory

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