How many people have to be in a room in order that the probability that at least two of them celebrate their birthday on the same day is at least 0.04? (Ignore leap years, and assume that all outcomes are equally likely.)
Added by Mark J.
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This is the same as 1 minus the probability that all people have different birthdays. The probability that two people have different birthdays is 364/365 because the second person can have a birthday on any day that is not the first person's birthday. If we add Show more…
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