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September 1, 2014

Posted by **michele** on Friday, April 22, 2011 at 5:15pm.

ANS CHOICES ARE

52040

8100

5040

1000

4000

- MATH - typo? -
**MathMate**, Friday, April 22, 2011 at 7:38pmAccording to the stated question, the conditions are:

The (serial) numbers are produced by two (distinct) letters ("two of these letters")*followed*by (any) two digits (0-9), then the number of ways products can be numbered will be:

first letter : 10 ways

second letter: 9 ways

first digit: 10 ways

second digit : 10 ways

Total=10*9*10*10=9000 ways.

If the two digits are to be*distinct*(which has not been specified), then there are 9 ways for the second digit and the total is 8100.

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