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For over two centuries, no one had been able to make Damascus blades—b

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Magoosh GMAT Instructor
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Re: For over two centuries, no one had been able to make Damascus blades—b [#permalink]

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New post 12 Mar 2018, 22:18
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zoezhuyan wrote:
Hi mikemcgarry, GMATNinjaTwo, GMATNinja, MagooshExpert Carolyn, sayantanc2k,
I am afraid i am still confused.
Honestly speaking, i did picked up B, my reasoning is as following:

The conclusion is : trace impurities in the iron are essential for the production of Damascus blades.
My interpretation of "essential" is necessary, it is impossible to produce Damascus blades without trace impurities. in a short, no trace impurities, no production.

per answer choice B, The iron with which the contemporary sword maker made Damascus blades came from a source of iron that was unknown two centuries ago.
1) if B is true, the source was unknown two centuries ago, in other words, no source,
2) as the prompt says, no one had been able to make Damascus blades, in other words , no production.
based on 1) and 2), no source, no production.

Per answer choice D, Production of Damascus blades by sword makers of the past ceased abruptly after those sword makers' original source of iron became exhausted
it is also "no source, no production".

I know there is impossible have two answer choice on GMAT. So i picked up randomly.
I known i am wrong, but i have no idea where is incorrect
Please help clarify,
Thanks in advance

Have a nice day
>_~


Hi zoezhuyan!

Happy to help :-)

First of all, great job narrowing down the essential parts of the argument! As you said, the key here is "no trace impurities, no production". In order to have those trace impurities, we either need the same source of iron as the original, or a similar source of iron with the same impurities.

Now, choice B says that the source of iron that was used in the new blades was unknown two centuries ago, when the old blades were made. This is actually the opposite of what we want. Remember that in order to make this blade, we need the same source of iron, or a similar one. If the iron used in the new blades was unknown when the original blades were made, then it probably isn't the same source, with the same impurities. So B actually weakens the argument, not strengthens it, since it basically tells us that the iron sources made to create the blades were not the same, and therefore likely did not have the same trace impurities (or at the very least, we don't know whether or not they did).

So D is the correct answer :-)

Does that make sense? If not, let me know! :-)
-Carolyn
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Re: For over two centuries, no one had been able to make Damascus blades—b [#permalink]

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New post 14 Mar 2018, 06:06
MagooshExpert wrote:
zoezhuyan wrote:
Hi mikemcgarry, GMATNinjaTwo, GMATNinja, MagooshExpert Carolyn, sayantanc2k,
I am afraid i am still confused.
Honestly speaking, i did picked up B, my reasoning is as following:

The conclusion is : trace impurities in the iron are essential for the production of Damascus blades.
My interpretation of "essential" is necessary, it is impossible to produce Damascus blades without trace impurities. in a short, no trace impurities, no production.

per answer choice B, The iron with which the contemporary sword maker made Damascus blades came from a source of iron that was unknown two centuries ago.
1) if B is true, the source was unknown two centuries ago, in other words, no source,
2) as the prompt says, no one had been able to make Damascus blades, in other words , no production.
based on 1) and 2), no source, no production.

Per answer choice D, Production of Damascus blades by sword makers of the past ceased abruptly after those sword makers' original source of iron became exhausted
it is also "no source, no production".

I know there is impossible have two answer choice on GMAT. So i picked up randomly.
I known i am wrong, but i have no idea where is incorrect
Please help clarify,
Thanks in advance

Have a nice day
>_~


Hi zoezhuyan!

Happy to help :-)

First of all, great job narrowing down the essential parts of the argument! As you said, the key here is "no trace impurities, no production". In order to have those trace impurities, we either need the same source of iron as the original, or a similar source of iron with the same impurities.

Now, choice B says that the source of iron that was used in the new blades was unknown two centuries ago, when the old blades were made. This is actually the opposite of what we want. Remember that in order to make this blade, we need the same source of iron, or a similar one. If the iron used in the new blades was unknown when the original blades were made, then it probably isn't the same source, with the same impurities. So B actually weakens the argument, not strengthens it, since it basically tells us that the iron sources made to create the blades were not the same, and therefore likely did not have the same trace impurities (or at the very least, we don't know whether or not they did).

So D is the correct answer :-)

Does that make sense? If not, let me know! :-)
-Carolyn


appreciate it. Carolyn, MagooshExpert
Re: For over two centuries, no one had been able to make Damascus blades—b   [#permalink] 14 Mar 2018, 06:06

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