steph1375
Mar 16, 2009, 07:51 PM
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.
ebaines
Mar 17, 2009, 07:06 AM
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?