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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]

23 Aug 2011, 16:45

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, 16:45

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A little difficult math problem, pls help me

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A little difficult math problem, pls help me

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