It is currently 21 Jan 2018, 18:47

### 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

# M13-04

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 43348

### Show Tags

15 Sep 2014, 23:48
Expert's post
6
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

74% (00:48) correct 26% (00:25) wrong based on 69 sessions

### HideShow timer Statistics

Which of the following is closest to $$\frac{1}{1.001}$$?

A. 0.997
B. 0.998
C. 0.999
D. 1.000
E. 1.001
[Reveal] Spoiler: OA

_________________
Math Expert
Joined: 02 Sep 2009
Posts: 43348

### Show Tags

15 Sep 2014, 23:48
2
KUDOS
Expert's post
1
This post was
BOOKMARKED
Official Solution:

Which of the following is closest to $$\frac{1}{1.001}$$?

A. 0.997
B. 0.998
C. 0.999
D. 1.000
E. 1.001

If $$a$$ is small, $$\frac{1}{(1 + a)}$$ is close to $$1 - a$$. This is because $$(1 - a)*(1 + a) = 1 - a^2$$, which is close to 1 if $$a$$ is small. So, $$\frac{1}{1.001} = \frac{1}{(1 + 0.001)}$$ is approximately $$1 - 0.001 = 0.999$$.

_________________
Manager
Joined: 30 Dec 2016
Posts: 86

### Show Tags

16 Dec 2017, 07:37
Hi Bunuel. My question is what is one supposed to learn from this question?

Am I supposed to learn the property that is mentioned in the solution? Will this property come handy in any other questions?
_________________

Regards
SandySilva

____________
Hit kudos if my post helped (:

Re: M13-04   [#permalink] 16 Dec 2017, 07:37
Display posts from previous: Sort by

# M13-04

Moderators: chetan2u, Bunuel

 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®.