What is the value of 1 -2 + 3 - 4 + 5 -6 + 7... - 2004 + 2005 - 2006 + 2007?
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What is the value of 1 -2 + 3 - 4 + 5 -6 + 7... - 2004 + 2005 - 2006 + 2007?
Quote:
Originally Posted by ceasar_19134
1 -2 + 3 - 4 + 5 -6 + 7... - 2004 + 2005 - 2006 + 2007 =
......................1 +(-2 + 3) + (- 4 + 5) + (-6 + 7)... +(- 2004 + 2005) + (- 2006 + 2007)
There are 1003 bracketed terms each of which has value 1, and an additional
1 at the beginning, so the sum is 1004.
RonL