How many different combinations

Oliver has 3 baseball caps, each a different colour---blue, yellow and red. Sometimes he likes to wear all 3 caps at once. one on top of another. In how many different orders can Oliver wear the 3 caps?
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1 Answer

There are 6 ways of ordering 3 different caps one on top of the other:

BRY, BYR, RBY, RYB, YBR, YRB.
by Top Rated User (1.2m points)

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