A person writes letters to six friends and addresses the corresponding envelopes

MATHEMATICS · Multi-part · CBSE · Mathematics · Permutations and Combinations · Permutations and Combinations

Problem

A person writes letters to six friends and addresses the corresponding envelopes. In how many ways can the letters be placed in the envelopes so that (i) At least two of them are in the wrong envelopes. (ii) All the letters are in the wrong envelopes.

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