Let the colors be Red (R), Yellow (Y), Green (G), Blue (B) and White (W); Let the numbers on the sides (on the faces) be 1, 2, 3 and 4. Then the space of outcomes is the space of all pairs (C,n), where C is one (any) of five letters symbolizing a color, and n is one (any) of numbers 1, 2, 3 and 4. The total number of elements (of events) in the outcomes space (= in the event space) is 5*4 = 20.