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A little difficult math problem, pls help me

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Re: A little difficult math problem, pls help me [#permalink] New post 23 Aug 2011, 15:45
Why is this true?
Sum of first x pages = x(x+1)/2
If x=5, meaning first five pages, then according to formula above 5(6)/2=15, when in fact sum of first 6 pages =21
Re: A little difficult math problem, pls help me   [#permalink] 23 Aug 2011, 15:45
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