First friend can have any day as a birthday 365/365. Next friend can have 364/365 days as a birthday. Next one 363/365. Next on 362/365. Last one 361/365. Probability of all 5 having different birthdays is then the product of those 5 fractions.
Victor J.
asked • 11/19/21What is the probability that a group of five friends all have different birthdays?
type of problem: (counting methods and probability) (probability of an event not occurring given multiple opportunities.)
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