How many outfits can be made from 4 pairs of slacks, 5 shirts, and 3 ties, if one selection from each category is made? Assume that all items fashionably match.
First decide on a pair of slacks.
For that there are 4 different choices.
Now for each of those choices, there is a choice of 5 different shirts, so that gives that 4 times 5 = 20 different slack/shirt combinations.
Again now for each those 20 possibilities, there is 3 different ties that can ...
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