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At "Porbability" chapter is a confusion between Permutations and Arrangements. There is an "equal" between Permutations and Arrangements. Probably the issue is because in other languages The Arrangements are marked by A (n,m) not by P(n,m). I see in English the real Permutations are marked by P(n,n) and P(n,m) which means A(n,m). Probably this is the cause of confusion or my confusion...
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