Difference between revisions of "2021 Fall AMC 10A Problems/Problem 21"
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Revision as of 18:35, 22 November 2021
Each of the balls is tossed independently and at random into one of the
bins. Let
be the probability that some bin ends up with
balls, another with
balls, and the other three with
balls each. Let
be the probability that every bin ends up with
balls. What is
?