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guessing a three digit pin code from an 8 key keypad

jridgeman99

New member
Feb 15, 2019
5
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

Administrator
Staff member
Feb 24, 2012
13,775
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

Administrator
Staff member
Jan 26, 2012
4,034
I'll just add on to Mark's comment that PINs are order-sensitive. 123 is not the same as 321.