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# V01-41

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Math Expert
Joined: 02 Sep 2009
Posts: 58434

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16 Sep 2014, 01:56
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Difficulty:

15% (low)

Question Stats:

79% (00:19) correct 21% (00:31) wrong based on 86 sessions

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The adoption of either method of extraction, open-pit mining or solution mining, will require miners to be certified in the use of safety equipment.

A. open-pit mining or solution mining
B. open-pit mining and solution mining
C. open-pit and solution minings
D. open-pit mining, including solution mining
E. mining by open-pit or by solution

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Joined: 02 Sep 2009
Posts: 58434

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16 Sep 2014, 01:56
Official Solution:

The adoption of either method of extraction, open-pit mining or solution mining, will require miners to be certified in the use of safety equipment.

A. open-pit mining or solution mining
B. open-pit mining and solution mining
C. open-pit and solution minings
D. open-pit mining, including solution mining
E. mining by open-pit or by solution

This sentence requires the grammatically correct extension of the phrase either method of extraction. The underlined portion must show contrast and agree with the singular word either by using the conjunction or.
1. This option correctly extends the phrase in the first part of the sentence to read either…open-pit mining or solution mining.
2. And is an incorrect conjunction, because it does not agree with either.
3. This option may seem more concise, but and is incorrect because it does not agree with either, and minings should not be plural.
4. In this option, the meaning of the sentence has been changed to incorrectly suggest that solution mining is a kind of open-pit mining.
5. Mining is redundant in this context, because it repeats the words method of extraction. This word order also makes the sentence awkward and confusing.

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20 Feb 2017, 10:46
I have a doubt: the idiom is either X or Y but could also be either X,Y or Z?
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Location: Germany
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25 Feb 2017, 04:27
lorenzo393 wrote:
I have a doubt: the idiom is either X or Y but could also be either X,Y or Z?

There may be difference opinion among grammarians whether "either..or" structure can be used for more than two options. However in GMAT such dubious points are not generally tested. (Neither it is tested in this question.)
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20 May 2017, 08:41
sayantanc2k wrote:
lorenzo393 wrote:
I have a doubt: the idiom is either X or Y but could also be either X,Y or Z?

There may be difference opinion among grammarians whether "either..or" structure can be used for more than two options. However in GMAT such dubious points are not generally tested. (Neither it is tested in this question.)

It looks like "Open Pit mining or Solution mining" is used as an non essential modifier here. With or without the underlined portion the sentence still makes sense? If true, Open Pit mining AND Solution mining makes sense here. Isnt it?
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17 Oct 2018, 04:31
this does not make sense
you expect to follow the either..or.. pattern and insert the menthod of extraction in two commas

either method of extraction? means there are two methods of extractions X and Y
either method of extraction wil.....
you cannot use OR here , because if you do then soluthion mining cannot be considered as a METHOD OF EXTR because the method of extr now plays as a modifier of noun pit mining.

we need "and" as we are choosing either from X and Y.
to use "or" you have to drop "method of extr from the sentence.
I would like to know which source was this replicated or where did u get this usage from. I'd like to correct my understanding if I'm wrong
Re: V01-41   [#permalink] 17 Oct 2018, 04:31
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# V01-41

Moderators: chetan2u, Bunuel