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posted by bob on Wednesday, January 18, 2012 at 4:10pm.
what is the sum of the odd numbers 1-2009
number 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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