In the above case, you can wear any of the 3 shirts and after wearing one of these shirts any of these pairs of pants with it. If we label the shirts as S1, S2, S3 and the pants as P1, P2, P3 and P4, then the different ways of dressing up can be as under:
Total number of ways = 12 = 3 × 4.
In this illustration, we multiply the number of ways in which you can wear a shirt and the number of ways in which you can wear a pair of pants.
