MathDiscrete mathCombinatorics

Combinations

Choosing a PIN

Report a typo

Suppose that you are asked to select a 4-digit PIN. Each digit must be chosen from the set $\{0, 2, 3, 5, 7, 8, 9\}$ and the PIN must not contain any repeated digits. How many choices do you have for such a PIN?

Enter a number

___

Create a free account to access the full topic