A Greek urn contains a red ball, a blue ball, a yellow ball, and an orange ball.

A Greek urn contains a red ball, a blue ball, a yellow ball, and an orange ball. A ball is drawn
from the urn at random and then replaced. If one does this 4 times, what is the probability that
all 4 colors were selected?
Answer key is 3/32.
Please explain in steps. Thanks!

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