What is the value of 1-2+3-4+5-6+..............-2004+2005-2006+2007?

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- May 9th 2007, 05:20 PMDragonNumber Pattern sum
What is the value of 1-2+3-4+5-6+..............-2004+2005-2006+2007?

- May 9th 2007, 05:32 PMOReilly
- May 9th 2007, 05:46 PMDragon
- May 9th 2007, 06:22 PMOReilly