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Mathematics 12 Online
OpenStudy (anonymous):

Your letter carrier has a problem. When she delivers letter to the five houses in your block, she delivers completely at random. Suppose she has five letters, one addressed to each house, and she delivers on letter to each house. In how many ways can this be accomplished if: a) No letter arrives at the right house? b) At least one letter arrives at the right house? c) All letters arrive at the right house?

OpenStudy (anonymous):

Somebody please?! I just want to verify my answers.

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