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How many ”words” can be formed by rearranging INQUISITIVE so that U does not immediately follow Q?

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#combinatorics
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Given 5 history texts, 3 sociology texts, 6 anthropology texts and 4 psychology texts,

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#combinatorics #combinations
169
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How many passwords with one or more digits?

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#combinatorics #discrete-mathematics
239
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Compute the Probability that a hand of 3 cards will contain a king and an ace of the same suit

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#probability #combinatorics #card-games
57
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How many numbers with $3,4,5$ together and the $6$ somewhere on the left of $5$?

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#combinatorics
884
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Probability such that at least one of the two balls drawn from an urn is red

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#probability #combinatorics
147
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Redistributing a fixed number of elements

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#combinatorics #algorithms
430
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Proving $\sum_{i=1}^{n} {{n}\choose{i}} (-1)^i = -1$ by induction

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#combinatorics #proof-verification #summation #induction #binomial-coefficients
182
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Combinatorics dance class

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#probability #combinatorics #self-learning
72
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Event scheduling

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#combinatorics
168
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Derangement with constraints

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#combinatorics #combinatorial-proofs
61
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Binomial Coefficients Proof Help

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#combinatorics #binomial-coefficients
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What is the sum of the binomial coefficients ${n\choose p}$ over prime numbers?

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#combinatorics #number-theory #summation #prime-numbers #binomial-coefficients
239
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Extraneous edges in hamiltonian graphs

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#combinatorics #graph-theory #hamiltonian-path
402
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Distribution of objects into equally-sized groups

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#combinatorics #permutations #combinations

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