A person writes letters to five friends and addresses on the corresponding envelopes. In how many ..

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Ankit Kumar

Ankit Kumar

6 күн бұрын

A person writes letters to five friends and addresses on the corresponding envelopes. In how many ways can the letters be placed in the envelopes so that
(a) all letters are in the wrong envelopes?
(b) at least three of them are in the wrong envelopes?

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