Question 62828
# of ways to get three winning tickets = 6C3
# of ways to get three non-winning tickets = 24C3
# of ways to get 3 win and 3 non-wiin = [6C3*24C3]
# of ways to draw 6 from the pool of 20= 30C6
Prob(3win 3no-win)=[6C3*24C3]/30C6=0.068
Cheers,
Stan H.