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Any medical test will sometimes fail to detect a condition

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by notyet » Mon Jul 17, 2017 9:36 pm
Hi�Guru
I now understand the problem from the perspective of pronoun! Thanks
But C just still seemed so unparallel to me ?

choice C: verb n vs verb clause
choice E: verb n vs verb n
So I just eliminated that choice at first sight instead ended with E ..which seemed more parallel without thinking pronoun thing.
Plus, how can I avoid making mistake like this..
Thank you !
GMATGuruNY wrote:
Any medical test will sometimes fail to detect a condition when it is present and indicate that there is one when it is not.

(A) a condition when it is present and indicate that there is one
(B) when a condition is present and indicate that there is one
(C) a condition when it is present and indicate that it is present
(D) when a condition is present and indicate its presence
(E) the presence of a condition when it is there and indicate its presence
In A, both one and it seem to refer to a condition.
The result is a nonsensical meaning:
Any medical test will sometimes indicate that there is ONE CONDITION when A CONDITION is not.
Eliminate A.

B and D distort the meaning by implying that the purpose of a medical test is to detect a MOMENT IN TIME: WHEN a condition is present.
The purpose of a medical test is to detect the CONDITION itself, not WHEN the condition is present.
Eliminate B and D.

In E, the first it could refer to the presence or to a condition.
Since C avoids this issue and is free of errors, eliminate E.

The correct answer is C.

The OA:
Any medical test will sometimes fail to detect a condition when it is present and indicate that it is present when it is not [present].
Here, each instance of it has the same, clear referent: a condition.
Note the use of ELLIPSIS: the word in brackets is omitted, but its presence is clearly understood.
The ellipsis is made clear by the PARALLEL FORMS: that IT IS PRESENT when IT IS NOT [PRESENT].
Only the OA offers these parallel forms at the end of the sentence.
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by GMATGuruNY » Mon Jul 24, 2017 3:21 am
notyet wrote:Hi�Guru
I now understand the problem from the perspective of pronoun! Thanks
But C just still seemed so unparallel to me ?

choice C: verb n vs verb clause
choice E: verb n vs verb n
The analysis in red is not quite right.

C: Any medical test will sometimes fail to detect a condition...and [will sometimes] indicate that it is present
Here, the words in brackets are omitted but implied.
The blue portion serves as the direct object of will fail.
The red portion serves as the direct object of will indicate.
Each of these direct objects includes a verb form.
Verb form in the blue portion: to detect.
Verb form in the red portion: is.

E: Any medical test will sometimes fail to detect the presence...and [will sometimes] indicate the presence.
Here again, the words in brackets are omitted but implied.
The blue portion serves as the direct object of will fail.
The red portion serves as the direct object of will indicate.
While the blue portion includes a verb form -- to detect -- the red portion does not.

Since the red portion in E does not include a verb form, the parallelism in E is inferior to that in C.
Eliminate E.
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by notyet » Wed Jul 26, 2017 4:57 am
Thanks! "Fail vs indicate" makes much sense !
But I consider "that is ..." to be a clause ,rather than a verb "is" ?

Or we might as well just take " fail to detect" as one verb to parallel the latter "indicate"...
GMATGuruNY wrote:
notyet wrote:Hi�Guru
I now understand the problem from the perspective of pronoun! Thanks
But C just still seemed so unparallel to me ?

choice C: verb n vs verb clause
choice E: verb n vs verb n
The analysis in red is not quite right.

C: Any medical test will sometimes fail to detect a condition...and [will sometimes] indicate that it is present
Here, the words in brackets are omitted but implied.
The blue portion serves as the direct object of will fail.
The red portion serves as the direct object of will indicate.
Each of these direct objects includes a verb form.
Verb form in the blue portion: to detect.
Verb form in the red portion: is.

E: Any medical test will sometimes fail to detect the presence...and [will sometimes] indicate the presence.
Here again, the words in brackets are omitted but implied.
The blue portion serves as the direct object of will fail.
The red portion serves as the direct object of will indicate.
While the blue portion includes a verb form -- to detect -- the red portion does not.

Since the red portion in E does not include a verb form, the parallelism in E is inferior to that in C.
Eliminate E.
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by GMATGuruNY » Wed Jul 26, 2017 8:58 am
notyet wrote:Thanks! "Fail vs indicate" makes much sense !
But I consider "that is ..." to be a clause ,rather than a verb "is" ?
C: Any medical test will sometimes fail to detect a condition...and [will sometimes] indicate that it is present
Here, the red portion and the blue portion can both be construed as clauses because each contains a verb form and an implied subject.
In the blue portion, the implied subject of to detect is any medical test:
Question: WHAT will sometimes not DETECT a condition?
Answer: ANY MEDICAL TEST will sometimes not detect a condition.
In the red portion, the implied subject of is is a condition:
Question: WHAT IS present?
Answer: A CONDITION IS present.

E: Any medical test will sometimes fail to detect the presence...and [will sometimes] indicate the presence.
Here, the red portion lacks a verb form and thus cannot be construed as a clause.
As result, the colored portions in E are less parallel than those in the OA.
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by Kaustubhk » Thu Jul 27, 2017 7:07 pm
Hi,

Regarding the usage of ONE, does it really matter if it is a same entity or a different entity as long as we know what we are referring to.



Correct me if my understanding is wrong.
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by Nick0203 » Tue Jan 15, 2019 12:42 am
In A, both one and it seem to refer to a condition. The result is a nonsensical meaning:
Any medical test will sometimes indicate that there is ONE CONDITION when A CONDITION is not.
Eliminate A.
B and D distort the meaning by implying that the purpose of a medical test is to detect a MOMENT IN TIME: WHEN a condition is present.
The purpose of a medical test is to detect the CONDITION itself, not WHEN the condition is present.
Eliminate B and D.
In E, the first it could refer to the presence or to a condition.
C avoids this issue and is free of errors.
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