Derangement - Art of Solving Problems | Find the Number of Derangements

Описание: Seven cards and seven envelopes are numbered 1,2,3,4,5,6,7 and cards are to be placed in envelopes so that each envelope contains exactly one card and no card is placed in the envelope bearing the same number. Find the number of ways to do it.

#IITJEE #Derangement

A version of this problem was asked in the entrance examination of Indian Institute of Technology (IIT), which is one of the most difficult examinations in the world.

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00:00 | Question which was asked in the previous video
00:18 | Congrats Avikal Shukla
00:28 | Explanation of the Question
00:57 | Solution
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