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There are four letters and four directed envelopes. The number
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There are four letters and four directed envelopes. The number of ways in which all the letters can be put in the wrong envelope is a. b. c. d. none of these

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Question Text
There are four letters and four directed envelopes. The number of ways in which all the letters can be put in the wrong envelope is a. b. c. d. none of these