Suppose we want to choose 3 letters, without replacement, from the 4 letters A, B,...
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Suppose we want to choose 3 letters, without replacement, from the 4 letters A, B, C, and D.(If necessary, consult a list of formulas.)(a) How many ways can this be done, if the order of the choices matters?(b) How many ways can this be done, if the order of the choices does not matter?
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