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probability.
15 letters and 15 envelopes, What is the probability that no letter is placed in the right envelope?
- by kevinc628
Mon Apr 23, 2012 5:31 am- Forum: Problem Solving
- Topic: probability.
- Replies: 6
- Views: 1945
15 letters and 15 envelopes, What is the probability that no letter is placed in the right envelope?