M10 #29 : GMAT Club Tests

M10 #29

Oldest

Best Reply

Author

Message

Intern

Joined: 21 Sep 2011

Posts: 14

GMAT 1: 570 Q32 V36

Followers: 0

Kudos [?]: 12 [0], given: 23

M10 #29 [#permalink]

11 Apr 2012, 09:16

00:00

Question Stats:

0% (00:00) correct

0% (00:00) wrong

based on 0 sessions

Hi, I found this problem in GMAT Club test 10:

If X and Y are prime integers, what is |X - Y|?

1) X + Y is a prime integer.
2) X and Y are less than 5.

My answer was B, 2 is sufficient. However, official answer is C. The explanation is that X and Y could be the same integer. This is probably a very basic question to ask, but I though that if you assigned two different variables, they would stand for two different value. E.g. If X =2, then Y cannot also equal 2.

Could someone clarify for me whether two different variables in a GMAT problem can, indeed, have the exact same value? E.g. X=Y. What is the standard convention in mathematics?

[Reveal] Spoiler: OA

Kaplan Promo Code

Knewton GMAT Discount Codes

Veritas Prep GMAT Discount Codes

GMAT Club team member

Joined: 02 Sep 2009

Posts: 11565

Followers: 1796

Kudos [?]: 9571 [1] , given: 826

Re: M10 #29 [#permalink]

11 Apr 2012, 09:50

This post received
KUDOS

FromScratch wrote:

Unless it is explicitly stated otherwise, different variables CAN represent the same number. So, x=y is a valid scenario.
_________________

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. NEW!!!

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set. NEW!!!

What are GMAT Club Tests?
25 extra-hard Quant Tests

Find out what's new at GMAT Club - latest features and updates

Re: M10 #29 [#permalink] 11 Apr 2012, 09:50

		Similar topics	Author	Replies	Last post
Similar Topics:	11	M10 #04	gameCode	10	05 Nov 2008, 13:13
	19	m10 Q13	smarinov	16	20 Dec 2008, 16:42
	18	M10 Q35	gk2k2	24	21 Dec 2008, 11:13
	5	m10 q18	georgechanhc	18	29 Dec 2008, 23:01

M10 #29

Moderator: Bunuel

Main navigation

GMAT Resources

Partners

MBA Resources

GMAT ® is a registered trademark of the Graduate Management Admission Council ® (GMAC ®). GMAT Club's website has not been reviewed or endorsed by GMAC.

GMAT Courses

Admissions Consulting

M10 #29

M10 #29

Main navigation

GMAT Resources

Partners

MBA Resources