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a If there are 6 people in a room, find the probability at least 2 were...

a If there are 6 people in a room, find the probability at least 2 were born in the same month. b How many people must be in

a If there are 6 people in a room, find the probability at least 2 were born in the same month. b How many people must be in a room to guarantee that at least 2 were born in the same month? C. In a crowd of 3000 people, must at least 8 have the same birthday?
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