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March 1, 2015

Posted by **bob** on Wednesday, January 18, 2012 at 4:10pm.

- math -
**Reiny**, Wednesday, January 18, 2012 at 5:23pmnumber of terms ---- n

a=1

term(n) = a + (n-1)d

2009 = 1 + (n-1)2

2009 = 1 + 2n - 2

2n = 2010

n = 1005

sum = (1005/2) (1 + 2009) = 1010025

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