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!4 = Sub-factorial (DERANGEMENT) I Learn Left-factorial or Sub-factorial
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!n = The number of ways a group of objects can be arranged so that none of the objects is in its original or correct place.In Permutation / combinatorial mathematics, a Sub-factorial is a permutation of the elements of a set in which no element appears in its original position.
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#math #mathstricks #mathematics #learnmaths #maths