Quote from: jeroenn13 on June 09, 2017, 12:25:17 AM

8916100400000 is the number of possibilities, no? Is it not 12 ^ 12?

Its permutation because it has an order. The formula is n!/(n-r)! which (n-r)! is not shown because it is understandable that it is one because n and r are same in value hence if subtracted would result to 0! or 1.

Quote from: cr1776 on June 09, 2017, 12:32:57 AM

Quote from: jeroenn13 on June 09, 2017, 12:25:17 AM

8916100400000 is the number of possibilities, no? Is it not 12 ^ 12?

No, 12! (12 factorial)
Or as Danny pointed out:
479,001,600

Your equation 12^12, I don't know where you get it but the right one has been pointed out. Danny's explanation is much easier to understand if you want to.

Combination on the other hand doesn't care for arrangement or order and the formula is (n!)/(r!(n-r)!).