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November 26, 2014

November 26, 2014

Posted by **Anonymous** on Wednesday, February 20, 2013 at 10:15am.

- algebra -
**Reiny**, Wednesday, February 20, 2013 at 10:22amAssuming that we can't start with 0 , or else it would be a 2 - digit number,

there are 9 choices for the 1st, then only 1 at the end

the middle can be any of the 10

number of such numbers

= 9 x 10 x 1 = 90

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