SOLUTION: how many 4-digit pins are possible if the first digit may not be a zero, and one of the digits may be repeated?
Algebra ->
Permutations
-> SOLUTION: how many 4-digit pins are possible if the first digit may not be a zero, and one of the digits may be repeated?
Log On
Question 412530: how many 4-digit pins are possible if the first digit may not be a zero, and one of the digits may be repeated? Answer by Alan3354(69443) (Show Source):
You can put this solution on YOUR website! 9*10*10*10 if you mean any digit can be repeated.
If one of them, and not the others, can be repeated, you'll have to clarify that.
= 9000 PINs
