SOLUTION: The password for a computer game consists of 4 numbers that can be repeated. How many passwords could be made that start with the number 5?

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Question 411947: The password for a computer game consists of 4 numbers that can be repeated. How many passwords could be made that start with the number 5?
Answer by vleith(2983) About Me  (Show Source):
You can put this solution on YOUR website!
There are 10 digits (0 -9)
This password is a 4 digit number. You are told the first digit is 5 and that repeats area allowed.
So the format of the password is
5XYZ where X, Y and Z are any one of 10 digits 0-9.
So you have
OneChoiceTheNumber5+%2B+10choicesforX+%2A+10choicesForY+%2A+10ChoicesForZ
1+%2B+10%2A10%2A10
1001