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# A little difficult math problem, pls help me

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Intern
Joined: 24 Feb 2011
Posts: 28
Re: A little difficult math problem, pls help me  [#permalink]

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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
Non-Human User
Joined: 09 Sep 2013
Posts: 10949
Re: A little difficult math problem, pls help me  [#permalink]

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24 Jul 2017, 01:17
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Re: A little difficult math problem, pls help me   [#permalink] 24 Jul 2017, 01:17

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