augustmck1017 augustmck1017

07-09-2018
Mathematics

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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 sqdancefan

07-09-2018

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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