It is currently 23 Jun 2017, 00:35

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# A little difficult math problem, pls help me

Author Message
Intern
Joined: 24 Feb 2011
Posts: 30
Re: A little difficult math problem, pls help me [#permalink]

### Show Tags

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

Go to page   Previous    1   2   [ 21 posts ]

Display posts from previous: Sort by