Gregg K. answered 09/28/18
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This problem is referring to the counting principle:
The Fundamental Counting Principle (also called the counting rule) is a way to figure out the number of outcomes in a probability problem. Basically, you multiply the events together to get the total number of outcomes. The formula is:
If you have an event “a” and another event “b” then all the different outcomes for the events is a * b.
If you have an event “a” and another event “b” then all the different outcomes for the events is a * b.
so for your problem
4 x 4 x 4 = 64