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4 December, 03:31

A boy mentions that none of the 21 kids in his third-grade class has had a birthday since school started 56 days previously. assume that kids in the class are drawn from a population whose birthdays have the same probability on all days of the year. what is the probability that 21 kids in such a class would not yet have a birthday in 56 days?

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  1. 4 December, 04:33
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    21/356 because there are 21 kids and 365 days in a year
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