It is currently 21 Oct 2017, 09:24

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

All the page numbers from a book are added, beginning at

Author Message
CEO
Joined: 15 Aug 2003
Posts: 3454

Kudos [?]: 919 [0], given: 781

All the page numbers from a book are added, beginning at [#permalink]

Show Tags

14 Sep 2003, 05:20
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 0 sessions

HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

All the page numbers from a book are added, beginning at page
1. However, one page number was mistakenly added twice. The sum obtained was 1000. Which page number was added twice?

a) 44
b) 45
c) 10
d) 12

Kudos [?]: 919 [0], given: 781

Intern
Joined: 12 Sep 2003
Posts: 31

Kudos [?]: [0], given: 0

Location: Peru
Re: PS : Page Number [#permalink]

Show Tags

14 Sep 2003, 21:32
The sum for 1+2+3+4+........n term = n * ((n+1)/2)

n * ((n+1)/2) = 1000 - something (added page)

n^2 + n =2000 - something

n^2 + n - (2000-something) = 0

Factorizing we should know that the result should be close to sqr(2000)

and sqr(2000) =sqr(100) * sqr(10) * sqr (2) = 40 plus something

so, we can plug 44 as n and then 44 * 22.5 = 990 + added page = 1000

Regards,

Kudos [?]: [0], given: 0

Re: PS : Page Number   [#permalink] 14 Sep 2003, 21:32
Display posts from previous: Sort by

All the page numbers from a book are added, beginning at

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.