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Arranging 3 types of balls

Published on
#combinatorics #combinations #inclusion-exclusion
61
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How to distribute N alike objects to M people with given constraints

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#combinatorics #number-theory #distribution-theory
240
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Combinatorial interpretation of alternating sum involving binomial coefficients

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#probability #combinatorics #binomial-coefficients #combinatorial-proofs
266
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The house numbers on a street each have 4 digits that range from 1000 to 9999. How many of these house numbers have exactly 2 digits that are 5?

Published on
#combinatorics #discrete-mathematics #permutations
212
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Numbering the vertices of a Fano plane

Published on
#combinatorics #graph-theory
598
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Probability and gloves

Published on
#probability #combinatorics
169
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Symmetric Brick Stacking

Published on
#combinatorics #symmetry
434
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Arrangements for multi-colored balls on a grid.

Published on
#combinatorics
39
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Solving optimal apportionment

Published on
#linear-algebra #combinatorics #matrix-equations
42
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Help with a combinatorial identity

Published on
#combinatorics
54
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$10$ questions selected from a bank of $25$ questions. Easiest question first and hardest question always last. # of different ways.

Published on
#combinatorics #combinations
141
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Invertible $2\times2$ matrices over $\mathbb{Z}/26\mathbb{Z}$

Published on
#combinatorics #matrices #ring-theory
106
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How to maximize the total auction price for a set of bids subject to bidder constraints

Published on
#linear-algebra #combinatorics #optimization #algorithms #extremal-combinatorics
185
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How many binary strings of length $10$ contain at least $4$ $0$'s?

Published on
#combinatorics #discrete-mathematics #permutations
135
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Combinatorics question on number of integer solutions given different restrictions

Published on
#combinatorics #combinations

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