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Suppose we want to choose 7 letters, without replacement, from 10 distinct letters. (a) How many ways can this be done, if the order of

Suppose we want to choose 7 letters, without replacement, from 10 distinct letters. (a) How many ways can this be done, if the order of the choices does not matter? X (b) How many ways can this be done, if the order of the choices matters

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