Question

To buy a computer system, a customer can choose one of 4 monitors, one of 2 keyboards, one of 4 computers and one of 3 printers. Determine the number of possible systems that a customer can choose from.

Answer 1

If we have to select r items from a total of n items then the no. of ways for doing that is given by $^nC_r$

No. of options the customer has to choose from

$^4C_1\times^2C_1\times^4C_1\times^3C_1=4\times2\times4\times3=96$