The number of ways can 10 letters be placed in 10 marked envelopes, so that no letter is in the right envelope are

JEE Main Mathematics question

The number of ways can letters be placed in marked envelopes, so that no letter is in the right envelope are

Answer: (A)

Placing each letter in a wrong envelope is a derangement of objects. By inclusion-exclusion,

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Question ID VK-020700