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How many ways accomplished-no letter arrives at right house

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Reference no: EM131569774

Question: Your letter carrier has a drinking problem. When she delivers letters to the seven houses in your block, she delivers completely at random. Suppose she has seven letters, one addressed to each house, and she delivers one 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?

Reference no: EM131569774

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