Seven sportsmen (named A,B,C,D,E,F and G) buy 7 hats choosing randomly out of 4 available colors (say G,R,W and Y).
What is the probability that all the colors were chosen?

(In reply to re: Solution by Charlie)

You are right. I feel that it is because I haven't seen this stuff for a while, so the algorithms aren't firing like they used to! Thanx!

Posted by John zadeh on 2010-04-28 16:14:09