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CR - Strengthen (easy one, but i confused with B & C)

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CR - Strengthen (easy one, but i confused with B & C)

by karthikpandian19 » Mon Jul 09, 2012 10:11 pm
The attrition of tooth enamel stems from erosion, which occurs only when teeth grind against hard substances. Therefore, those who regularly clench or grind their teeth together will suffer higher rates of enamel attrition than those who do not.

Which of the following most strongly supports this argument?

(A) Tooth enamel can be chipped in sports accidents.
(B) Grinding and clenching both have the same effect on tooth enamel.
(C) Tooth enamel is an extremely hard substance.
(D) Most people do not grind or clench their teeth together.
(E) Front teeth are more likely to grind against one another than back teeth are.
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by Kasia@EconomistGMAT » Tue Jul 10, 2012 12:09 am
The argument consists of one premise, which in part contains two parts:
1. attrition stems from erosion
2. erosion occurs when teeth grind against HARD substances.

Conclusion: people who regularly clench or grind their teeth will more often suffer from attrition than those who do NOT.

Now let's try to think up a POSSIBLE answer without looking at the alternatives given.
We need to find another premise that will make the argument more plausible. If attrition occurs when people grind their teeth against HARD SUBSTANCES and those who grind their teeth TOGETHER are supposed to suffer from attrition more often, the clear inference is that TEETH MUST BE REALLY HARD.
As to answer B, whether people grind or clench their teeth is of no importance. This answer is a distractor.
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by karthikpandian19 » Tue Jul 10, 2012 12:38 am
Ha ha i fell for the distractor B

Kasia@MasterGMAT wrote:The argument consists of one premise, which in part contains two parts:
1. attrition stems from erosion
2. erosion occurs when teeth grind against HARD substances.

Conclusion: people who regularly clench or grind their teeth will more often suffer from attrition than those who do NOT.

Now let's try to think up a POSSIBLE answer without looking at the alternatives given.
We need to find another premise that will make the argument more plausible. If attrition occurs when people grind their teeth against HARD SUBSTANCES and those who grind their teeth TOGETHER are supposed to suffer from attrition more often, the clear inference is that TEETH MUST BE REALLY HARD.
As to answer B, whether people grind or clench their teeth is of no importance. This answer is a distractor.
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by vk_vinayak » Thu Jul 12, 2012 2:16 am
karthikpandian19 wrote:Ha ha i fell for the distractor B

Kasia@MasterGMAT wrote:The argument consists of one premise, which in part contains two parts:
1. attrition stems from erosion
2. erosion occurs when teeth grind against HARD substances.

Conclusion: people who regularly clench or grind their teeth will more often suffer from attrition than those who do NOT.

Now let's try to think up a POSSIBLE answer without looking at the alternatives given.
We need to find another premise that will make the argument more plausible. If attrition occurs when people grind their teeth against HARD SUBSTANCES and those who grind their teeth TOGETHER are supposed to suffer from attrition more often, the clear inference is that TEETH MUST BE REALLY HARD.
As to answer B, whether people grind or clench their teeth is of no importance. This answer is a distractor.
me too fell for the trick :) Good question.
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by Manjareev » Thu Jul 12, 2012 4:48 am
gud question :D
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by jaiswalamrita » Wed Jul 25, 2012 12:47 am
caught by B :(
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by karthikpandian19 » Tue Oct 09, 2012 12:35 am
OA is C
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by ihatemaths » Tue Oct 09, 2012 1:42 am
@karthick and @Kasia Does C really strengthen or by POE we getting at it ? I don't see any good reason of how C strengthens the arguement .

After all it deals with the texture and sturdiness of the teeth
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by karthikpandian19 » Tue Oct 09, 2012 2:25 am
Hi,

The argument says tooth enamel attrition happens becoz of grinding against hard substances. Then it concludes with those who grinds / clenches teeth will suffer high % of attrition.

Assumption shld be Tooth enamel is to be HARD.....but since this is kind of difficult to generate this answer, POE also helps us to attain this



The attrition of tooth enamel stems from erosion, which occurs only when teeth grind against hard substances. Therefore, those who regularly clench or grind their teeth together will suffer higher rates of enamel attrition than those who do not.

Which of the following most strongly supports this argument?

(A) Tooth enamel can be chipped in sports accidents.
(B) Grinding and clenching both have the same effect on tooth enamel.
(C) Tooth enamel is an extremely hard substance.
(D) Most people do not grind or clench their teeth together.
(E) Front teeth are more likely to grind against one another than back teeth are.
ihatemaths wrote:@karthick and @Kasia Does C really strengthen or by POE we getting at it ? I don't see any good reason of how C strengthens the arguement .

After all it deals with the texture and sturdiness of the teeth
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by akashkumar1987 » Tue Oct 09, 2012 3:37 am
Can you please explain how you eliminated the other answers
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by karthikpandian19 » Tue Oct 09, 2012 4:53 am
The attrition of tooth enamel stems from erosion, which occurs only when teeth grind against hard substances. Therefore, those who regularly clench or grind their teeth together will suffer higher rates of enamel attrition than those who do not.
The argument says tooth enamel attrition happens becoz of grinding against hard substances. Then it concludes with those who grinds / clenches teeth will suffer high % of attrition.
Which of the following most strongly supports this argument?
THIS IS A STRENGTHEN QUESTION

(A) Tooth enamel can be chipped in sports accidents. --- Sports accidents are not mentioned here in this argument. Also it talks abt chipping and not atrition. Eliminate
(B) Grinding and clenching both have the same effect on tooth enamel. - States the same info as mentioned in the passage. Eliminate
(C) Tooth enamel is an extremely hard substance. ----- Perfect assumption (refer expl)
Assumption shld be Tooth enamel is to be HARD.....but since this is kind of difficult to generate this answer, POE also helps us to attain this

(D) Most people do not grind or clench their teeth together. - Process method is explained. Irrelevant. No mention about the attrition.
(E) Front teeth are more likely to grind against one another than back teeth are. - No mention about the classification abt teeth is mentioned. hence irrelevant
akashkumar1987 wrote:Can you please explain how you eliminated the other answers
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by vikram4689 » Tue Oct 09, 2012 5:14 am
akashkumar1987 wrote:Can you please explain how you eliminated the other answers
Hi Akash,

Lets dissect the argument.
Premise: erosion causes attrition of enamel and erosion occurs only when teeth grind against hard substances i.e.
grinding against hard substances only --> erosion --> attrition of enamel

Conclusion: when people grind or clench teeth, attrition occurs.

Since grinding against hard substances is the only cause that causes erosion and hence attrition, it means that enamel itself is hard substance because when teeth are grinded eventually enamel on tooth gets grinded.

Hence C is correct. Incorrect option B would be correct on a "must be true" question since we can conclude/infer that statement from the argument.
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by Sapana » Sat Jan 05, 2013 8:53 pm
Fell for B :(.. Mind Blown after reading the explanation.. Awesome!
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