Question

The combination for opening a safe is a four-digit number made up of different digits. How many different combinations cna you make, using only odd digits?

Answer 1

120

Explanation:

My choices are: 1, 3, 5, 7, 9. I cannot repeat any of the numbers.

The first spot, I have 5 choices. The second spot, I have 4 choices, the third spot, I have 3 choices and the final spot has only 2 choices.

5x4x3x2 = 60