I toss two coins and look at the outcome. I then tell you that at least one of the coins is showing up as "tails". What is the chance that the other one is showing "tails" as well?

(from techInterview.org)

(In reply to re: It's not 1/3 the way the problem was posed. by Bryan)

I agree with Bryan. You are told that one coin is tails, but not which coin is tails giving you the three ppossible outcomes instead of the two. t-t, t-h, h-t are all different possibilities, only one being favorable.

Posted by Jon on 2003-04-11 08:19:44