Amat, Actually you are not entirely wrong. The question was not specific enough. Thus two of you answered the question differently. You found the probability that 2 AND ONLY 2 share the same birth month. Whereas the other one found the probability that ATLEAST 2 will share the same birth month. The original question did not specify which. So cheers to both of you! Modou. ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com ---------------------------------------------------------------------------- To unsubscribe/subscribe or view archives of postings, go to the Gambia-L Web interface at: http://maelstrom.stjohns.edu/archives/gambia-l.html ----------------------------------------------------------------------------