A customer in a computer store can choose one of four monitors, one of three keyboards, and one of five computers. How do you determine the number of possible system configurations?
Monitors: 1 of 4
Keyboards: 1 of 3
Computers: 1 of 5
Notice the pattern:
I can pair 4 monitors with first keyboard. Then once more 4 monitors but now with the second keyboard. Then again with the third keyboard.
If we include computers into the pattern we get:
Monitors x Keyboards x Computers
We have 60 different possibilities of choosing monitors, keyboards and computers.