Question

Can you use the numbers 1, 2, 3, and 4 in a combination of four digits to assign a unique ID code to each of 500 people? Explain your reasoning.

Answer 1

No.

Explanation:

There are 4 numbers and they can be arranged in 4! ways.

4! = 4*3*2*1 = 24 ways so it is not possible to assign a unique 4 digit number to 500 people.