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anvesh004
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daagh
Is there anything wrong with the transcription? There is a semi-colon, but there is no IC after that in all the five choices. Also, none of the 'which' choices has a comma preceding it. Looks like an upstart job.

Is this from MGMAT?

Probably, if we change the semicolon into a colon, we may choose A.


Dear Sir,

There is a mistake i made while uploading the question. I missed changing the punctuation in the answer choices.
Edited the same now.
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anvesh004
A personal computer contains two principal types of memory; ROM(Read Only Memory) that cannot be altered, and RAM, that is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

A.) A personal computer contains two principal types of memory; ROM(Read Only Memory) that cannot be altered, and RAM, that is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

B.) A personal computer contains two principal types of memory, ROM(Read Only Memory) which cannot be altered, along with RAM, usually in the form of DRAM(Dynamic Random Access Memory) that can be changed but loses all data if power stops.

C.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

D.) A personal computer contains two principal types of memory, ROM(Read Only Memory) that cannot be altered, as well as RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

E.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but lose all data if power stops.
Note here that this options SEEMS parallel but the last sentence gives it away as being incorrect. "but lose all data" is wrong grammatically.


This question isn't so much about when to use "that" or "which", instead, it requires good comprehension skills to be able to see that parallelism can be met without only looking at black and white, rote memorized parallel grammar rules. The GMAT tests test takers in that it will make questions difficult by making it hard to just use rules. A little comprehension goes a long way. So it's important to up your reading of high quality articles during your study sessions (Economist, New Yorker etc). Option C is the only clear parallel and correct answer choice.

C.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops. The "and RAM" is followed by a comma and a description of said RAM, do not let that deter you into thinking it MUST be parallel too. What follows is "which can be" and this is parallel to the earlier "which cannot be" marker.
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A.) A personal computer contains two principal types of memory; ROM(Read Only Memory) that cannot be altered, and RAM, that is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

B.) A personal computer contains two principal types of memory, ROM(Read Only Memory) which cannot be altered, along with RAM, usually in the form of DRAM(Dynamic Random Access Memory) that can be changed but loses all data if power stops.

C.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

D.) A personal computer contains two principal types of memory, ROM(Read Only Memory) that cannot be altered, as well as RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

E.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but lose all data if power stops.
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anvesh004
A personal computer contains two principal types of memory; ROM(Read Only Memory) that cannot be altered, and RAM, that is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

A.) A personal computer contains two principal types of memory; ROM(Read Only Memory) that cannot be altered, and RAM, that is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

B.) A personal computer contains two principal types of memory, ROM(Read Only Memory) which cannot be altered, along with RAM, usually in the form of DRAM(Dynamic Random Access Memory) that can be changed but loses all data if power stops.

C.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

D.) A personal computer contains two principal types of memory, ROM(Read Only Memory) that cannot be altered, as well as RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

E.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but lose all data if power stops.

In OA-C , there is no comma before 'which'. I believe a comma before 'which' is necessary.

AjiteshArun , GMATNinja , MagooshExpert , GMATGuruNY , VeritasPrepBrian , MartyMurray , DmitryFarber , daagh , generis , other experts - please enlighten
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anvesh004
A personal computer contains two principal types of memory; ROM(Read Only Memory) that cannot be altered, and RAM, that is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

A.) A personal computer contains two principal types of memory; ROM(Read Only Memory) that cannot be altered, and RAM, that is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

B.) A personal computer contains two principal types of memory, ROM(Read Only Memory) which cannot be altered, along with RAM, usually in the form of DRAM(Dynamic Random Access Memory) that can be changed but loses all data if power stops.

C.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

D.) A personal computer contains two principal types of memory, ROM(Read Only Memory) that cannot be altered, as well as RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops.

E.) A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered, and RAM, which is usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but lose all data if power stops.

In OA-C , there is no comma before 'which'. I believe a comma before 'which' is necessary.

AjiteshArun , GMATNinja , MagooshExpert , GMATGuruNY , VeritasPrepBrian , MartyMurray , DmitryFarber , daagh , generis , other experts - please enlighten

I also have the same doubt. Which always has a comma before it.
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Skywalker18
can you please tell me your reasoning for option C
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@Experts:
I have read that the GMAT is not particularly stringent about having a comma before which. In this answer choice C the statement having "which"(in bold below) is not enclosed in a comma pair either. But we do see a single comma just before AND (in bold below). I believe whatever follows after comma +AND must to be an independent clause.
(Unless of course it is a part of a parallel list having multiple items). But, in this case Looking at what follows after AND, It doesn't look like a clause. It was my reasoning for eliminating this option choice. Can experts shed some light here.
Is the single comma before AND valid?

Choice C: "A personal computer contains two principal types of memory: ROM(Read Only Memory) which cannot be altered,and RAM, usually in the form of DRAM(Dynamic Random Access Memory) which can be changed but loses all data if power stops."
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Is there any difference in the usage of that and which or it is just that for both the sentence to be parallel, both the sides should either use that or should either use which.

Also, can you please help me understand why is option E wrong
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Rickooreo
Is there any difference in the usage of that and which or it is just that for both the sentence to be parallel, both the sides should either use that or should either use which.

Also, can you please help me understand why is option E wrong

Hello Rickooreo,

We hope this finds you well.

To answer your query, there is a difference between "that" and "which" - “that” is used to provide information needed to preserve the core meaning of the sentence, and the “comma + which” construction is used to provide extra information.

Further, Option E suffers from subject-verb disagreement - it incorrectly refers to the singular "RAM" with the plural verb "lose".

We hope this helps.
All the best!
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