In the context of probability, an experiment is a process:
First, he has to decide on a pair of shirts and he has 7 different colors to choices.
A value between 0 and 1, inclusive, describes the relative possibility (chance or likelihood) that an event will occur.
For each of those choices he has a choice of 7 different shirts, so that gives him 3 times 7 = 21 different shirts.
For each of those 21 possibilities, he has 21 times 3 = 63 different outfits, and some of them may be acceptable to wear in public.
It is simply,3*3*7=64 ways.
The number of favorable outcomes is divided by the number of possible outcomes.
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