There are four letters and four envelopes addressed to different persons. in how many ways can wrong choices be made
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We need to follow De-arrangement Theory to solve this question. This theory is used when we need to solve for the Wrong arrangement of things.
We are given that 4 letters are placed in 4 envelop such that All are in wrong places.
Hence,
Number of letters in right place: 4C0 = 1
Number of letters in the wrong places:
Total ways = 4C0 x 9 = 9
We are given that 4 letters are placed in 4 envelop such that All are in wrong places.
Hence,
Number of letters in right place: 4C0 = 1
Number of letters in the wrong places:
Total ways = 4C0 x 9 = 9
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