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Combinatoric meaning of $a_n=5a_{n-1} - 6a_{n-2}$

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#combinatorics #generating-functions
53
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how many ways we can select a team of $5$?

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#combinatorics #combinations
87
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in how many ways 5 projects be completed?

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#combinatorics #combinations
478
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Combinatorics question involving recurrence relations and n-gon

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#combinatorics #recurrence-relations
205
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Combinatorics question involving incongruent integral-sided triangles

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#combinatorics #recurrence-relations
129
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Birthday problem with limited bucket size

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#probability #combinatorics #birthday
68
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Generating function of $(1+x)^n*(1+x+x^2)$

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#combinatorics #discrete-mathematics #generating-functions
108
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Combinatorial proofs of several binomial sums

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#combinatorics #discrete-mathematics #binomial-coefficients #combinatorial-proofs
82
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question on probability theory

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#probability #combinatorics #permutations
561
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Colored graph with $2$ colors

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#combinatorics #graph-theory #puzzle
399
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Probability of two specific words in 26 random letters

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#probability #combinatorics
68
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Having at least one row of zeros on $5\times5$ board

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#probability #combinatorics
53
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Find even sum from a given set

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#combinatorics
2.5k
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For positive integers between 999 and 100 inclusive, how many contain the digit 5?

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#combinatorics #inclusion-exclusion
227
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show number of partitions of $n$ equals to number of partitions of $n-k$

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#combinatorics #integer-partitions

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