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Letters and Envelopes Problem

There are 5 letters and 5 envelopes and for each letter there is only one right envelope present.In how many ways can one put the letters in the envelopes so that no letter is in the right envelope? I would be really glad to get a hint about its solution.

Note by Sazzad Sayyed
3 years, 7 months ago

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Thanks for the reply. Sazzad Sayyed · 3 years, 6 months ago

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ya it is the no. of derangements Sitesh Pattanaik · 3 years, 7 months ago

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@Sitesh Pattanaik I think the answer is 44. Bhargav Das · 3 years, 6 months ago

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Hi; You want the number of derangements. This link covers it all.

link Bobbym None · 3 years, 7 months ago

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