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  1. #1
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    What is the value of...

    What is the value of 1 -2 + 3 - 4 + 5 -6 + 7... - 2004 + 2005 - 2006 + 2007?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by ceasar_19134 View Post
    What is the value of 1 -2 + 3 - 4 + 5 -6 + 7... - 2004 + 2005 - 2006 + 2007?

    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
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