Question

A garage door code has 5 digits, if no digit is repeated how many codes are possible

Answer 1

30,240

Explanation:

For the first digit: 10 options

For the second: 10 - 1 = 9 options

For the third: 9 - 1 = 8 options

For the fourth: 8 - 1 = 7 options

For the fifth: 7 - 1 = 6 options

10×9×8×7×6

30,240