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Liar Students (Posted on 2012-02-20) Difficulty: 1 of 5
There is a class of 7 students. Student 1 tells lie once a week. Student 2 tells lies twice a week and so on. Students 7 tells lies 7 times a week. A student will not lie more than once in a day. What is the probability that 7 students lie on the same day?

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Solution Comment 2 of 2 |
(7!) / (7^7) = 0.612%
  Posted by hoodat on 2012-02-21 02:18:05
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