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What is the probability that at least 2 of the presidents of [#permalink]
05 Nov 2003, 13:19

What is the probability that at least 2 of the presidents of the United States
have died on the same day of the year? If you bet this has happened, would you win your bet?

Draw a tree diagram. Two presidents so two events. for one president 365 days for each of these 365 there are again 365 days. so bottom is 365^2. Only on line from the tree will have same day like day1 and day1 or day21 and day21. so the probability is