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December 21, 2014

December 21, 2014

Posted by **cee cee** on Thursday, May 31, 2012 at 8:22pm.

- math -
**Reiny**, Thursday, May 31, 2012 at 8:45pmFirst number is a, common difference is 1

sum(25) = 1000

(25/2)(2a + 24(1) ) = 1000

2a + 24 = 80

2a = 56

a = 28

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