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If four letters are put into four envelopes, what is the probability of only three letters are into correct envelopes?

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If four letters are put into four envelopes at random, what is the probability that only three of the letters are put into the correct envelopes?

posted May 16 by anonymous

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1 Answer

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1/24
Probability for first correct letter in the right envelop is 1/4, probability of second letter is 1/3, probability of third letter is 1/2, so 1/(4x3x2)=1/24 is the answer

answer Jul 5 by Hanifa Mammadov
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