http://en.wikipedia.org/wiki/Lottery_mathematics http://en.wikipedia.org/wiki/Lottery_mathematics has a worked out example for a lottery that involves picking 6

http://en.wikipedia.org/wiki/Lottery_mathematics http://en.wikipedia.org/wiki/Lottery_mathematics has a worked out example for a lottery that involves picking 6 distinct numbers from {1..49}. It would be straightforward to adapt that to Cash WinFall.