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Why D is correct?

I find E maintains parallelism in it.
either by X or by Y
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Both in option D and E, we have "either by", so IMO rest of the items also should have "by" to maintain parallelism.

I am convinced neither by D nor by E ?
Or
I am convinced neither by D nor E ?

Can someone explain ?
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Both in option D and E, we have "either by", so IMO rest of the items also should have "by" to maintain parallelism.

I am convinced neither by D nor by E ?
Or
I am convinced neither by D nor E ?

Can someone explain ?

E commits a violation in the parallel structure. This is an important pattern in gmat.
by X,Y,Z /// by X, by Y, by Z
both of them are correct. Other structures like the one in E is wrong.

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chesstitans
Every one of the police reports have been filed so that they can be located either by their case number, the date they were created, or the victim's last name.

A)have been filed so that they can be located either by their case number, the date they were created, or the victim's last name

B) have been filed so that they can be located either by their case numbers, the dates they were creaed, or by the victim's last names

C) has been filed so that they can be located either by their case number, the date they were created,or the victim's last name

D) has been filed so that it can be located either by its case number, the date it was created, or the victim's last name

E) has been filed so that it can be located either by its case number, the date it was created, or by the victim's last name


"Every one of the police reports " will not be tested in the actual gmat; here, Kaplan just wants to confuse test takers.
I fail to understand why E option is not parallel: can anyone explain why it is wrong

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As far as i see either by x or by y is a correct structure

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As far as i see either by x or by y is a correct structure

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You have "by" before case number, you have "by" before victim's last name but no "by" before "the date"..
So, not parallel StrugglingGmat2910.
Hope it's clear now.

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alokgupta1009
StrugglingGmat2910
As far as i see either by x or by y is a correct structure

Sent from my MI MAX 2 using GMAT Club Forum mobile app
You have "by" before case number, you have "by" before victim's last name but no "by" before "the date"..
So, not parallel StrugglingGmat2910.
Hope it's clear now.

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Now i understood. I understood E is in this format "by X, (modifies X) or by Y" - Only two branches X and Y.
But the answer needs to be "by X, Y or Z"
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Hi Imyuva, the correct answer should be “ by x, y or z” or “by x, by y or by z”
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bichthuy
Hi Imyuva, the correct answer should be “ by x, y or z” or “by x, by y or by z”

Both are correct: In the first case, "by" is outside the parallel structure (hence used once and covers all the three elements), in the latter inside (hence repeated).
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I am going with D. Reason

The structure "every one of the X's" is always singular. 
example:-
Every one of us is happy. 
Every one of the students is happy. 

So left with C, D and E

C) has been filed so that they can be located either by their case number, the date they were created,or the victim's last name. They cannot refer to Everyone. We need IT

D) has been filed so that it can be located either by its case number, the date it was created, or the victim's last name

E) has been filed so that it can be located either by its case number, the date it was created, or by the victim's last name . In E we have 3 things that need to be parallel. case number, the date it was created and the victim's last name. by using "BY" before the victim's last name its makes the sentence not parallel.
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Everyone is singular so we need to use ‘has’ and after ‘either by’ we have a perfect parallel structure…..so correct choice is D
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bichthuy
Hi Imyuva, the correct answer should be “ by x, y or z” or “by x, by y or by z”

Both are correct: In the first case, "by" is outside the parallel structure (hence used once and covers all the three elements), in the latter inside (hence repeated).
Hey Sayantanc

Just to be 100 percent sure

In a sentence

... either by X, Y or Z... is correct and you too agree that the option D has correct parallelism ?

Pls suggest.

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Every one of the police reports have been filed so that they can be located either by their case number, the date they were created, or the victim's last name.

A)have been filed so that they can be located either by their case number, the date they were created, or the victim's last name - Incorrect, Every one is singular and have is used so SV violation

B) have been filed so that they can be located either by their case numbers, the dates they were creaed, or by the victim's last names - Same as Option A

C) has been filed so that they can be located either by their case number, the date they were created,or the victim's last name - Use of they which is plural as incorrect as everyone is singular

D) has been filed so that it can be located either by its case number, the date it was created, or the victim's last name - CORRECT, maintains parallelism as all the three entities 1) Case Number 2) date it was created 3) Victim's last name are parallel and connected commonly by the marker "BY"

E) has been filed so that it can be located either by its case number, the date it was created, or by the victim's last name - Incorrect, violates parallelism as there is by before case number and victim's last name but no by before the date it was created.

Both the structures are correct - 1) BY X,Y,Z 2) either by X or by Y or by Z

So a straight Option D
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IMO, this sentence has an inherent Structural flaw.

In "either X or Y" idiomatic construction, we can place only one list (word/phrase/clause) to replace X/Y. Hence, there has to be a parallelism of two lists (X // Y).

Whereas, in the stated sentence, we have two lists substituting X.

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either X or Y :
the structure can take a list of 2 elements
if i have a list of 3 elements,OR can used.
X,Y,OR Z

Posted from my mobile device

i think in option D,either should not be there
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bichthuy
Hi Imyuva, the correct answer should be “ by x, y or z” or “by x, by y or by z”

Both are correct: In the first case, "by" is outside the parallel structure (hence used once and covers all the three elements), in the latter inside (hence repeated).

According to my knowledge as per E-GMAT, either..or is a dual-word marker .. here in the question the list comprises of 3 elements.

Is my doubt valid?
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As per Kaplan Prep 2018 that I have, "either" does not appear in any of the 5 options.
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