Question

A thief steals an ATM card and must randomly guess the correct four-digit pin code from a 10-key keypad. Repetition of digits is allowed. What is the probability of a

correct guess on the first try?

Answer 1

There are 10,000 possible codes. The probability of guessing the code on the first try is 0.0001 or 1/10,000.

Answer 2

I think it's either 1 out of 44, 1 out of 40, or 1 out of 10, or 4 out of 10