SOLUTION: A four digit code using numbers from 1 to 5 is used for remote access to an answering machine. Determine the probability that a randomly selected code has the same first three di

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Question 1115503: A four digit code using numbers from 1 to 5 is used for remote access
to an answering machine. Determine the probability that a randomly
selected code has the same first three digits.

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
There are N=5%2A5%2A5%2A5=625 possible codes.
There are 5 possible codes that have the same first three numbers.
ABC1
ABC2
ABC3
ABC4
ABC5
where ABC are the correct first three digits to your code.
So,
P=5%2F625
P=1%2F125