MHB Guessing a three digit pin code from an 8 key keypad

[jridgeman99]

Hello, the problem is as follows. I'm not sure if it is a permutation or combination problem. It says if a thief steals and ATM card and must randomly guess the correct three digit pin code from an 8 key keypad. Repetition of digits is allowed. What is the probability of a correct guess on the first try?

 

[MarkFL]

Hello, the problem is as follows. I'm not sure if it is a permutation or combination problem. It says if a thief steals and ATM card and must randomly guess the correct three digit pin code from an 8 key keypad. Repetition of digits is allowed. What is the probability of a correct guess on the first try?

How many PIN codes are possible...can you apply the fundamental counting principle to answer this question?

 

[Jameson]

I'll just add on to Mark's comment that PINs are order-sensitive. 123 is not the same as 321.