Results 1 to 4 of 4

Thread: BIrthday probability

  1. January 19th 2009, 04:42 AM #1
    mathaddict
    mathaddict is offline
    MHF Contributor
    Joined
    Sep 2008
    From
    West Malaysia
    Posts
    1,261

    BIrthday probability

    Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
    Follow Math Help Forum on Facebook and Google+
  2. January 19th 2009, 05:39 AM #2
    Mush
    Mush is offline
    Super Member
    Joined
    Dec 2008
    From
    Scotland
    Posts
    901
    Quote Originally Posted by mathaddict View Post
    Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
    Can you find the probability that 2 people from 3 DO have the same birthday?
    Follow Math Help Forum on Facebook and Google+
  3. January 19th 2009, 05:49 AM #3
    sumit2009
    sumit2009 is offline
    Junior Member
    Joined
    Jan 2009
    Posts
    38
    probability that all will have different Birthdays
    =(365X364X363    ) /( 365X365X365)

    =(364X363) / (365X365)
    Follow Math Help Forum on Facebook and Google+
  4. January 19th 2009, 08:15 AM #4
    mr fantastic
    mr fantastic is offline
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,953
    Thanks
    5
    Quote Originally Posted by mathaddict View Post
    Find the probability that in a group of 3 people no two have the same birthday assuming that a year has 365 days .
    Same technique as post #6 in this thread: http://www.mathhelpforum.com/math-he...-problems.html

    Google birthday paradox for a lot more info.
    Follow Math Help Forum on Facebook and Google+
« probability again .. | question »

Similar Math Help Forum Discussions

  1. Probability that celebrities are less likely to die in the month of their birthday
    Posted in the Statistics Forum
    Replies: 8
    Last Post: November 22nd 2010, 06:15 AM
  2. Probability of having the same birthday
    Posted in the Statistics Forum
    Replies: 12
    Last Post: February 18th 2010, 03:14 PM
  3. Birthday probability
    Posted in the Statistics Forum
    Replies: 1
    Last Post: November 12th 2009, 09:47 PM
  4. Probability birthday same day
    Posted in the Statistics Forum
    Replies: 7
    Last Post: February 17th 2008, 10:52 PM
  5. The Birthday Problem (another probability question)
    Posted in the Advanced Statistics Forum
    Replies: 4
    Last Post: April 29th 2007, 01:11 AM

Search Tags


/mathhelpforum @mathhelpforum