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12 May, 07:56

7+9+11 ... + 2013-5-7-9 - ... 2011

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  1. 12 May, 08:13
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    If you would like to calculate 7 + 9 + 11 + ... + 2011 + 2013 - 5 - 7 - 9 - 11 - ... - 2011, you can do this using the following steps:

    7 + 9 + 11 + ... + 2011 + 2013 - 5 - 7 - 9 - 11 - ... - 2011 = (7 + 9 + 11 + ... + 2011) + 2013 - 5 + ( - 7 - 9 - 11 - ... - 2011) = 2013 - 5 = 2008

    The correct result is 2008.
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