If I’m trying to find the number of unique different combinations for 8 numbers why isn’t the answer all 99999999 excluding all zero.

Question

I think the number is 40,320.

Edit: Background…For work we need to create a unique code for fraud detection and the code can be no longer than 8 numerical digits. The generation of this number is another story. This is just for my own understanding.

In: 0

Answer 1

You can make the numbers 1 through 40,320 and then some with only 5 digits, up to 99999.

8 digits is as you’d expect, 99999999