Question

A password should have four numbers. Each number must be a numeral from 0 to 9. How many possible password combinations are there?

Answer 1

10,000

Explanation:

there are 4 digits that can be used and 0-9 has 10 numbers in total (0,1,2,3,4,5,6,7,8,9) so 10 to the power of 4 or 10 x 10 x 10 x 10 which equals 10,000