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 Post subject: math question
PostPosted: Wed Mar 31, 2010 5:10 pm 
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Joined: Wed Dec 09, 2009 12:59 pm
Posts: 11
What is the difference of sum of the even numbers & sums of odd numbers between 1 - 1000.


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PostPosted: Wed Mar 31, 2010 5:13 pm 
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Joined: Thu Jan 03, 2008 8:26 am
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Location: Watford, Herts
Pair them up:

(2-1) + (4-3) + (6-5) + ... + (1000-999)

There are 500 subtractions, each of which comes out as 1, so they add up to 500.


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PostPosted: Wed Mar 31, 2010 5:52 pm 
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Joined: Wed Dec 09, 2009 12:59 pm
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Thank you!! It was right!!! :D


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