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OG question - confused

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Manager
Joined: 01 May 2009
Posts: 105

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11 Jun 2009, 08:39
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Guys, this is a question from the OG. I didn't understand the OE, Could you please help. The file has been attached for your reference.
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Doc1.doc [41.5 KiB]

Director
Joined: 01 Apr 2008
Posts: 872
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Re: OG question - confused [#permalink]

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11 Jun 2009, 09:26
B. 21

Mileage between A to B is the same as mileage between B to A.

So start putting X in the first row...All columns of first row will be filled = 6 entries
Now, come to second row..first column..mileage between B to A is the same as mileage between A to B ( i.e.first row second column, which is already entered )...so new entries will be from B-B, B-C, B-D, B-E, B-F ( so, one entry is less ) => total entries = 6+5=11

for third row, start from C-C to C-F...and so on...

so total number of entries which are duplicated = 0 ( first row ) + 1 ( second row ) + 2 ( third row) + 3 ( fourth row) + 4 ( fifth row ) + 5 ( sixth row ) = 15
Hence total entries to be filled = (6*6) = 36 - 15 = 21 ( simple ! )
Manager
Joined: 01 May 2009
Posts: 105
Re: OG question - confused [#permalink]

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11 Jun 2009, 09:49
Economist wrote:
B. 21

Mileage between A to B is the same as mileage between B to A.

So start putting X in the first row...All columns of first row will be filled = 6 entries
Now, come to second row..first column..mileage between B to A is the same as mileage between A to B ( i.e.first row second column, which is already entered )...so new entries will be from B-B, B-C, B-D, B-E, B-F ( so, one entry is less ) => total entries = 6+5=11

for third row, start from C-C to C-F...and so on...

so total number of entries which are duplicated = 0 ( first row ) + 1 ( second row ) + 2 ( third row) + 3 ( fourth row) + 4 ( fifth row ) + 5 ( sixth row ) = 15
Hence total entries to be filled = (6*6) = 36 - 15 = 21 ( simple ! )

Thank you for the prompt response. The problem is that I am not familiar with the word 'mileage' in this context, is it a separate concept that GMAT tests? any responses around this would be highly appreciated.

By the way, the OA is not B.
Current Student
Joined: 03 Aug 2006
Posts: 115
Re: OG question - confused [#permalink]

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11 Jun 2009, 10:26

Mileage is the distance in miles between any two points.

In this example it is the distance is miles between any two cities. See the image attached for the solution. Also remember distance between city A and city B is the same as the distance between city B and city A. Also the distance between city A and city A does not need to be counted.
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Answer.jpg [ 21.31 KiB | Viewed 860 times ]

Manager
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Re: OG question - confused [#permalink]

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11 Jun 2009, 16:57
nookway wrote:

Mileage is the distance in miles between any two points.

In this example it is the distance is miles between any two cities. See the image attached for the solution. Also remember distance between city A and city B is the same as the distance between city B and city A. Also the distance between city A and city A does not need to be counted.

Thank you! I get it now.

The OA is indeed A i.e., 15
Director
Joined: 01 Apr 2008
Posts: 872
Name: Ronak Amin
Schools: IIM Lucknow (IPMX) - Class of 2014
Re: OG question - confused [#permalink]

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11 Jun 2009, 22:52
nookway wrote:

Mileage is the distance in miles between any two points.

In this example it is the distance is miles between any two cities. See the image attached for the solution. Also remember distance between city A and city B is the same as the distance between city B and city A. Also the distance between city A and city A does not need to be counted.

Oops...i am a bit rusty ...A to A, B to B ..F to F should be omitted so, 21-6 = 15.
Re: OG question - confused   [#permalink] 11 Jun 2009, 22:52
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