If you wanted to know how many 5 digit combinations you could make using only 2 digits how would you solve this?

Simple enough to solve.

The answer is a power of two.

Assuming you have two possible digits, say for example, 3 and 4, then you simply have to multiply it by how many numbers you want to get the total number of combinations.

Each number can be 3 or 4 in this case, and you have 5 numbers. That's two to the fifth. Five combinations of any two numbers. 2x2x2x2x2.

The answer is 32 combinations.