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by HonoreDB
Tue Feb 06, 2007 4:51 pm UTC
Forum: Logic Puzzles
Topic: Problem That Came Up in a Stats Class (Solution)
Replies: 4
Views: 2571

Problem That Came Up in a Stats Class (Solution)

We have items A1, A2, ... Am and groups G1, G2, ... Gn. First we must assign an A to each G, as the groups are nonempty. There are m*(m-1)*...*(m-n) ways to do this or m!/n!. Given such an assignment, we have left m-n A's, each one of which can be assigned to any group, for (m-n)^n possibilities. So...

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