Chapter 2 - Section 2-1 - Sample Spaces and Events - Exercises - Page 26: 2-16

S= (4,200), (4,300), (4,400), (8,200), (8,300), (8,400), (12,200), (12,300), (12,400)

There are nine possible orders that the computer system can have. So, you can have any amount of memory with either of the 3 possible disk storage sizes available.