math
posted by Jenny .
the smallest number of people in a room where the probability of two of them having the same birthday is at least fifty percent
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The smallest class where the chance of finding two people with the same birthday is 50% or more is... a class of 23 people. (The probability is about 50.73%.)

The smallest number of people in a room where the probability of two of them having the same birthday is at least 50 percent.