Forum: Puzzles
2021-10-30, 15:32
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Replies: 4
Views: 1,152
If n > 1 is an integer, a permutation...
If n > 1 is an integer, a permutation \sigma\;\in\;S_{n} - the group of permutations of the set of integers from 1 to n - is called a derangement if it has no fixed points; that is, \sigma(k)\;\ne\;k...
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Forum: Puzzles
2021-10-29, 18:23
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Replies: 4
Views: 1,152
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