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Often, when evaluating theoretical probability of something, say a lottery game or a card game, you consider permutations and combinations, in order to assess the number of outcomes that are possible versus the number that are desired.

When you work with permutations and combinations, you often work with factorials. In short, the factorial of a number is the product of that number and all of the numbers successively smaller by one until you get to one, i.e. 5 factorial is 5 x 4 x 3 x 2 x 1 or 120.

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Q: Define the term factorial in probability?
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