1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Birthday probability

  1. Nov 12, 2005 #1
    this is the problem...
    there are 25 students in a Data Management Class. Determine the probability that at keast two of them share the same birthday. (Assume that every year has 365 days)
    --> i have no clue what technique what to do here... coz this is a thinking question so its kinda hard for me...
  2. jcsd
  3. Nov 12, 2005 #2
    Well, the way to do this is to work out the probability of each of them having different birthdays, then subtract that from 1. For starters, if there were only 2 people in the class, what is the probability that they would have different birthdays?
  4. Nov 12, 2005 #3
    is it 1-(364/365)?
    Last edited: Nov 12, 2005
  5. Nov 13, 2005 #4
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Threads - Birthday probability Date
Birthday problem with repetitions Dec 4, 2014
Probability problem - birthdays Apr 6, 2011
Birthday problem Jan 21, 2010
Help on the doomsday equation/birthday equation Jan 28, 2007
Probability of sharing a birthday Nov 7, 2005