# 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?

Dec 31, 2017

60

#### Explanation:

Given:
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.
That is $4 + 4 + 4 = 12$ or Monitors $\times$ Keyboard=4*3=12

If we include computers into the pattern we get:
Monitors x Keyboards x Computers$= 4 \times 3 \times 5 = 60$

We have 60 different possibilities of choosing monitors, keyboards and computers.