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Probability of winning when at least one 6 appears when 6 fair dice are rolled

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#probability #permutations #dice
65
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Finding semidefiniteness of a matrix without constraints

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#matrices #permutations #positive-semidefinite
513
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Number of ways to distribute n different cards to r people, if the order also matters

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#combinatorics #permutations
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Is a Sudoku a Cayley table for a group?

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#combinatorics #group-theory #finite-groups #permutations #sudoku
139
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How to find the total number of cases in which either a row or column is vacant?

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#combinatorics #permutations
175
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In how many ways we can order 20 balls in line with non-adjacent block rule of 5 red balls

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#combinatorics #discrete-mathematics #permutations #combinations
265
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A NASCAR race has 53 drivers racing on Sunday. How many different combinations are there for 1st, 2nd, and 3rd place?

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#permutations
544
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27 people in groups of 3 so they are never with the same people after 13 rounds

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#permutations #combinations
412
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Word-Problem on Forbidden Position Permutations (Derangement)

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#combinatorics #discrete-mathematics #permutations #word-problem #derangements
18.6k
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How many ways can a natural number n be expressed as a sum of one or more positive integers, taking order into account?

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#combinatorics #permutations #combinations
892
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Prove that the Leibniz formula for determinant of a square matrix $T$ is equal to the product of eigenvalues of $T$

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#linear-algebra #permutations #determinant #cyclic-groups
75
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Proving the tightness of a theorem regarding permutations

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#combinatorics #permutations #pigeonhole-principle
90
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Different ways to solve a number sequencing problem

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#combinatorics #permutations #recurrence-relations #generating-functions #dynamic-programming
3k
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how many 4 digit odd numbers can be formed with 0,3,5,4 and 2 if repetition of digits is allowed

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#combinatorics #permutations #combinations
45
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Number of mappings of letters to letters

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#combinatorics #permutations

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