If 
experiments are performed with 
possible outcomes for each experiment 
, then there are a total of 
possible outcomes.
Counting Generalized Principle
Explore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Counting Generalized Principle." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/CountingGeneralizedPrinciple.html