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Source: — Problem Solving |
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by anayeri » Wed Dec 03, 2008 10:31 am
From Eric's Flashcards:

To find the number of distinct permutations of a set
of items with indistinguishable items, divide the
factorial of the items in the set by the product of
the factorials of the number of indistinguishable
So, 5!/2!
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