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There are 4 letters and 4 envelopes. In how many ways can wrong choices be made?
- A43
- B4! – 1
- C16
- D44 – 1
Answer not set
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CCommunity
Number of ways in which letters can be placed in envelopes = 4!
Number of ways of putting all the four letters in correct envelopes = 1
∴ Number of ways in which wrong choice can be made = 4! - 1
Number of ways of putting all the four letters in correct envelopes = 1
∴ Number of ways in which wrong choice can be made = 4! - 1