In the table above what is the least number of table entries

Oldest

Best Reply

Author

Message

TAGS:

Senior Manager

Joined: 31 Oct 2011

Posts: 334

Followers: 1

Kudos [?]: 23 [0], given: 18

In the table above what is the least number of table entries [#permalink]

15 Mar 2012, 19:59

00:00

Question Stats:

60% (01:37) correct

40% (00:14) wrong

based on 0 sessions

Attachment:

Table.png [ 3.59 KiB | Viewed 733 times ]

In the table above, what is the least number of table entries that are needed to show the mileage between each city and each of the other five cities?

A. 15
B. 21
C. 25
D. 30
E. 36

Sorry for the messy picture.. :oops:

[Reveal] Spoiler: OA

Last edited by Bunuel on 16 Mar 2012, 04:00, edited 1 time in total.

Edited the question and the image

Senior Manager

Joined: 10 Nov 2010

Posts: 270

Location: India

Concentration: Strategy, Operations

GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21

WE: Information Technology (Computer Software)

Followers: 4

Kudos [?]: 19 [1] , given: 22

Re: PT #13 PS2 Q 13 [#permalink]

15 Mar 2012, 21:28

This post received
KUDOS

eybrj2 wrote:

In the table above, what is the least number of table entries that are needed to show the mileage between each city and each of the other five cities?

a) 15

b) 21

c) 25

d) 30

e) 36

Sorry for the messy picture.. :oops:

Total number of entries 6*6(6rows*6columns) =36
Now 6 entries are representing mileage with the city itself so subtract that => 36-6
Minimum entries required = half the Total = 30/2 = 15
_________________

The proof of understanding is the ability to explain it.

GMAT Club team member

Joined: 02 Sep 2009

Posts: 11611

Followers: 1801

Kudos [?]: 9597 [0], given: 829

Re: PT #13 PS2 Q 13 [#permalink]

16 Mar 2012, 03:58

eybrj2 wrote:

The least number of table entries will be if we use only one entry for each pair of the cities. How many entries would the table then have? Or how many different pairs can be selected out of 6 cities?

C^2_{6}=15

Answer: A.

Similar question to practice: each-dot-in-the-mileage-table-above-represents-an-entry-95162.html

Hope it helps.
_________________

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: PT #13 PS2 Q 13 [#permalink] 16 Mar 2012, 03:58

		Similar topics	Author	Replies	Last post
Similar Topics:		The table above shows the number of students in a certain	gluon	8	23 Sep 2007, 09:01
		The table above shows the number of students on three teams	snowbirdskier	3	08 Dec 2008, 12:33
	1	Each • in the mileage table above represents an entry indica	snkrhed	8	02 Jun 2010, 10:32
	5	What is the sum of the integers in the table above?	Baten80	13	06 Apr 2011, 14:21
	5	In the table above, what is the number of green marbles in J	Bunuel	7	01 Oct 2012, 05:11

In the table above what is the least number of table entries

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

In the table above what is the least number of table entries

In the table above what is the least number of table entries

Main navigation

GMAT Resources

Partners

MBA Resources