Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 27 Aug 2016, 06:38

### 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

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

Author Message
TAGS:

### Hide Tags

Senior Manager
Joined: 31 Oct 2011
Posts: 324
Followers: 1

Kudos [?]: 713 [1] , given: 18

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

### Show Tags

15 Mar 2012, 19:59
1
KUDOS
5
This post was
BOOKMARKED
00:00

Difficulty:

25% (medium)

Question Stats:

66% (01:37) correct 34% (00:36) wrong based on 119 sessions

### HideShow timer Statistics

Attachment:

Table.png [ 3.59 KiB | Viewed 7862 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
[Reveal] Spoiler: OA

Last edited by Bunuel on 29 Jul 2014, 09:02, edited 2 times in total.
Edited the question and the image
Senior Manager
Joined: 10 Nov 2010
Posts: 267
Location: India
Concentration: Strategy, Operations
GMAT 1: 520 Q42 V19
GMAT 2: 540 Q44 V21
WE: Information Technology (Computer Software)
Followers: 5

Kudos [?]: 238 [1] , given: 22

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

### Show Tags

15 Mar 2012, 21:28
1
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..

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.

Math Expert
Joined: 02 Sep 2009
Posts: 34456
Followers: 6277

Kudos [?]: 79627 [2] , given: 10022

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

### Show Tags

16 Mar 2012, 03:58
2
KUDOS
Expert's post
2
This post was
BOOKMARKED
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..

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?

$$C^2_{6}=15$$

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

Hope it helps.
_________________
Joined: 04 Jul 2014
Posts: 284
Location: India
GMAT 1: 640 Q47 V31
GMAT 2: 640 Q44 V34
GMAT 3: 710 Q49 V37
GPA: 3.58
WE: Analyst (Accounting)
Followers: 17

Kudos [?]: 203 [0], given: 403

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

### Show Tags

29 Jul 2014, 07:30
Hi Bunuel!

I understand how we have arrived at 15. Here, we assume that the distance from a city to another city is the same even when the origin and destination is flipped.

But, there is a possibility to travel from City A to City B in 5 Kilometers and from City B to City A in 10 kilometers (since the route is a one way or something). The question merely asks what the least number of table entries must be and not the least number of table entries in the shortest possible route (which could remove the possible assumption that there are no one ways). So, shouldn't the answer be 30?

Bunuel wrote:
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..

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?

$$C^2_{6}=15$$

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

Hope it helps.

_________________

Cheers!!

JA
If you like my post, let me know. Give me a kudos!

Math Expert
Joined: 02 Sep 2009
Posts: 34456
Followers: 6277

Kudos [?]: 79627 [0], given: 10022

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

### Show Tags

29 Jul 2014, 09:04
joseph0alexander wrote:
Hi Bunuel!

I understand how we have arrived at 15. Here, we assume that the distance from a city to another city is the same even when the origin and destination is flipped.

But, there is a possibility to travel from City A to City B in 5 Kilometers and from City B to City A in 10 kilometers (since the route is a one way or something). The question merely asks what the least number of table entries must be and not the least number of table entries in the shortest possible route (which could remove the possible assumption that there are no one ways). So, shouldn't the answer be 30?

Bunuel wrote:
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..

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?

$$C^2_{6}=15$$

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

Hope it helps.

You are over-thinking. If the distance from A to B is 5 miles, then the distance from B to A is also 5 miles.
_________________
GMAT Club Legend
Joined: 09 Sep 2013
Posts: 11095
Followers: 511

Kudos [?]: 134 [1] , given: 0

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

### Show Tags

21 Oct 2015, 23:19
1
KUDOS
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: In the table above what is the least number of table entries   [#permalink] 21 Oct 2015, 23:19
Similar topics Replies Last post
Similar
Topics:
10 The table above shows the distribution of the number 5 27 Mar 2014, 16:56
17 In the table above, what is the least number of table entrie 13 24 Jan 2014, 03:51
13 In the table above, what is the number of green marbles in J 22 01 Oct 2012, 05:11
25 What is the sum of the integers in the table above? 22 06 Apr 2011, 14:21
81 Each • in the mileage table above represents an entry indica 29 02 Jun 2010, 10:32
Display posts from previous: Sort by