If one event can occur in m ways, a second
event in n ways and a third event in r, then
the three events can occur in m × n × r ways.
Example Erin has 5 tops, 6 skirts and 4 caps
from which to choose an outfit.
In how many ways can she select one top, one
skirt and one cap?
Solution: Ways = 5 × 6 ×