If I put nine pieces of paper, with a digit from 1-9 written on each one, into a hat, and pull 3 out without replacement, what is the likelihood that I will select three numbers that result in a winning tic-tac-toe?

 1 | 2 | 3 
---+---+---
 4 | 5 | 6 
---+---+---
 7 | 8 | 9 

(In reply to order doesn't matter by GOM)

If you wish to know the function that gets 84, it is the combination function.
The exact formula is 9!/(9-3)!/3!=9*8*7/3*2*1=84.

Posted by Tristan on 2004-07-30 21:47:14