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Suppose that 4 ​thank-you notes are written and 4 envelopes are addressed.​ accidentally, the notes are randomly inserted into the envelopes and mailed without checking the addresses. What is the probability that all the notes will be inserted into the correct​ envelopes

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sqdancefan

There are 4! = 24 permutations of notes and envelopes. Of those, only one is correct.

The probability of all notes being in correct envelopes is 1/24.

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