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probabilty math
Find the probability that among r people, there will be at least one whose birthday is the same as yours ( you may assume no one is born on a leap day, including yourself.
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The probability that at least one person has the same birthday as you is equal to one minus the probabilit that no one has the same birthday as you. If r = 1, the probability that he has does not have the same birthday as you is 364/365. If r= 2, then the probability that both people have different birthdays than you is (364/365)^2. Can you take it from here? |
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