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3 digit code

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Three digit codes 2019-07-14
From Jessica:
I need to find the total number of 3 digit codes using the digits 1 through 9. How many of these codes would be odd numbers, and how many even?
Answered by Penny Nom.
A three digit code 2019-07-14
From Hannah:
I have a briefcase with a three-digit code. I can set the code myself using digits 1 through 9, assuming that each digit can only be used once. How many possible codes are there?
Answered by Penny Nom.
A three digit entry code 2010-04-14
From Bryon:
The entry code for the executive bathroom is a three-digit odd number with no repeated digits. If you want to try to break in, what is the maximum number of numbers you'll have to try? (Remember that the three-digit numbers cannot start with zero.)
Answered by Stephen La Rocque and Penny Nom.
 
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