Question 432702
a) 1/20 * 9/20 * 1/20 = 9/8000
.
c) 
1/20 * 9/20 * 19/20 * 2 = 342/8000
(1/20)^2 * 11/20 = 11/8000
342/8000 + 11/8000 = 353/8000
.
Ed