GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 13 Aug 2018, 23:43

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Author Message
Manager
Joined: 12 Apr 2006
Posts: 202
Location: India

Show Tags

24 Jun 2009, 04:03
00:00

Difficulty:

(N/A)

Question Stats:

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

HideShow timer Statistics

Please explain the shortest possible method for this type of question. TIA

Attachment:

PS.jpg [ 18.17 KiB | Viewed 903 times ]

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.
Director
Joined: 03 Jun 2009
Posts: 755
Location: New Delhi
WE 1: 5.5 yrs in IT

Show Tags

24 Jun 2009, 04:40
1
On a quick look, one can say that the series would be something like:

1/2 - 1/4 + 1/8 - 1/16 +1/32 - 1/64 ...
=(1/2 - 1/4) + (1/8 - 1/16) +(1/32 - 1/64) ...
= 1/4 + 1/16 + 1/64 ....

Now, since all these are fractional values, less then 1, and values decreasing as we move on, certainly the sum would be a small value less then 1.

So, options A and B are out.

Option E is out, since the series is 1/4 + ...+ve values

Now, for C and D :
For the sum of the series to be > 1/2, we would need to add 1/4 (or higher value) to the 1st term (i.e. 1/4). But as all the subsequent terms are 1/4th of the previous term and the value keeps on decreasing as we move to the right, the sum would be something near 1/4 (and cannot be greater then 1/2).

--== Message from GMAT Club Team ==--

This is not a quality discussion. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

_________________
Display posts from previous: Sort by

Events & Promotions

 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®.