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This is a sufficient assumption question, which is not relevant in GMAT. so be careful while selecting assumption questions from LSAT. Only necessary assumption questions are asked in GMAT.

Necessary Vs sufficient condition " is often used in GMAT. The answer choices that GMAT provides are very well in accordance to necessary or sufficient condition. For your reference an article from egmat on Necesary Vs Sufficient consition.
https://e-gmat.com/blogs/gmat-critical- ... onditions/
In the above link there are some OFFICIAL examples discussed too.

Please do not suggest such things. See to it that there is ENOUGH evidence to your claim !!
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manishcmu
This is a sufficient assumption question, which is not relevant in GMAT. so be careful while selecting assumption questions from LSAT. Only necessary assumption questions are asked in GMAT.

Necessary Vs sufficient condition " is often used in GMAT. The answer choices that GMAT provides are very well in accordance to necessary or sufficient condition. For your reference an article from egmat on Necesary Vs Sufficient consition.
https://e-gmat.com/blogs/gmat-critical- ... onditions/
In the above link there are some OFFICIAL examples discussed too.

Please do not suggest such things. See to it that there is ENOUGH evidence to your claim !!

AdityaHongunti - Chill bro! You are mixing up conditional statements (that do show up in GMAT) with Sufficient assumption. Egmat talks about necessary and sufficient conditions in a CONDITIONAL statement . Necessary assumption that comes in GMAT is REQUIRED by the argument. Sufficient assumption is a kind of assumption that when true GUARANTEES the conclusion in the argument.
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By the way, I revere LSAT questions. If someone wants to solve then it is a great question. However, I feel that it is not relevant to GMAT.
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In the above example there the author says that the old ppl CAN lower..... He does not say WILL lower... But for the "CAN", part to occur we need an assumption a necessary one which is about the VIT D.
And that's provided by A.
If the author had said that the old ppl WILL lower...then that would not be a SUFFICIENT assumption... coz we need to even make sure all other conditions are satisfied the

"CAN" is different than WILL"

YOU CAN succeed in GMAT
Does not mean YOU WILL...

So there isn't actually any point of necessary Vs sufficient...

The conclusion itself is mild enough to just allow for 1 assumption...it does not demand both a necessary and a sufficient condition.

Posted from my mobile device
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A is the right answer if you treat it as a sufficient assumption question (which is what you should do as per the question stem). But this is definitely not the right answer for Necessary assumption. Will the argument break if active Vitamin D is not present in the milk and old people get Vitamin D from other food sources? No. Still some older people can lower their blood pressure. This answer choice is correct because it GUARANTEES that some older people can lower their blood pressure but it is definitely not REQUIRED by the argument. This is where difference between necessary and sufficient assumption comes in.
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Why is C wrong..?

Can anybody please help..
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Why is C wrong..?

Can anybody please help..

C is wrong because this is a sufficient assumption question. So, the negation test won't work here. The test that you can do here is to see whether the assumption guarantees the conclusion. Only A guarantees the conclusion because it says that active Vitamin D is present in milk, so calcium will be absorbed by old people who drink milk, thereby lowering blood pressure. C does not guarantee that calcium in the milk will be absorbed by the body.
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(A) There is in milk, in a form that older people can generally utilize, enough of the active form of vitamin D and any other substances needed in order for the body to absorb the calcium in that milk.

First, other substance are not mentioned in stimulus.
And it might be possible that other substance activate vitamin D to absorb calcium.

C seems better choice.
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manishcmu
A is the right answer if you treat it as a sufficient assumption question (which is what you should do as per the question stem). But this is definitely not the right answer for Necessary assumption. Will the argument break if active Vitamin D is not present in the milk and old people get Vitamin D from other food sources? No. Still some older people can lower their blood pressure. This answer choice is correct because it GUARANTEES that some older people can lower their blood pressure but it is definitely not REQUIRED by the argument. This is where difference between necessary and sufficient assumption comes in.



i agree. will option c be a necessary assumption??

thanks
roy
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generis GMATNinja VeritasKarishma

Although i selected A as the answer , I would like to get clarity on option B.

Quote:
(B) Milk does not contain any substance that is likely to cause increased blood pressure in older people.

If we negate this option , it will become

Quote:
Milk DOES not contain any substance that is likely to cause increased blood pressure in older people.

If this is the case, drinking milk will increase blood pressure among the old people and will therefore hamper the argument.

What do you think??
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generis GMATNinja VeritasKarishma

Although i selected A as the answer , I would like to get clarity on option B.

Quote:
(B) Milk does not contain any substance that is likely to cause increased blood pressure in older people.

If we negate this option , it will become

Quote:
Milk DOES not contain any substance that is likely to cause increased blood pressure in older people.

If this is the case, drinking milk will increase blood pressure among the old people and will therefore hamper the argument.

What do you think??


Dear Experts,

Kindly help

generis GMATNinja VeritasKarishma
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warrior1991
generis GMATNinja VeritasKarishma

Although i selected A as the answer , I would like to get clarity on option B.

Quote:
(B) Milk does not contain any substance that is likely to cause increased blood pressure in older people.

If we negate this option , it will become

Quote:
Milk DOES not contain any substance that is likely to cause increased blood pressure in older people.

If this is the case, drinking milk will increase blood pressure among the old people and will therefore hamper the argument.

What do you think??

You can't use assumption negation technique here. Read the question stem again:
The physician’s conclusion is properly drawn if which one of the following is assumed?

We need to properly draw the conclusion. This means that we need an assumption which will be sufficient for the argument. Though in GMAT, assumption is defined as a missing necessary premise, in this LSAT question we are looking for a sufficient premise. We need something that will establish the conclusion. Option (A) along with the given premises helps establish the conclusion.
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warrior1991
generis GMATNinja VeritasKarishma

Although i selected A as the answer , I would like to get clarity on option B.

Quote:
(B) Milk does not contain any substance that is likely to cause increased blood pressure in older people.

If we negate this option , it will become

Quote:
Milk DOES not contain any substance that is likely to cause increased blood pressure in older people.

If this is the case, drinking milk will increase blood pressure among the old people and will therefore hamper the argument.

What do you think??

You can't use assumption negation technique here. Read the question stem again:
The physician’s conclusion is properly drawn if which one of the following is assumed?

We need to properly draw the conclusion. This means that we need an assumption which will be sufficient for the argument. Though in GMAT, assumption is defined as a missing necessary premise, in this LSAT question we are looking for a sufficient premise. We need something that will establish the conclusion. Option (A) along with the given premises helps establish the conclusion.


VeritasKarishma

Thank you for explaining. So you mean to say that had it been a GMAT question, this option would be correct.
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VeritasKarishma is this question relevant to GMAT? There is some discussion that it isn't. Also if you could please provide an example of sufficient v necessary condition.
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warrior1991

Thank you for explaining. So you mean to say that had it been a GMAT question, this option would be correct.


GMAT and LSAT questions are designed differently. The question stem and the options both would be given as per the test. If you are using LSAT questions to practice for GMAT, you need to understand the differences between the two tests, else it could lead to confusion.
As far as GMAT is concerned, an assumption is a missing necessary premise.
This LSAT question asks you for a sufficient assumption to draw the conclusion. Hence the point of "if this were a GMAT question" does not arise. It is an LSAT question.

ajalil86
Here is a post that talks about the necessary and sufficient statements:
https://www.gmatclub.com/forum/veritas-prep-resource-links-no-longer-available-399979.html#/2012/1 ... onditions/
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Hi,

I rejected option A because the passage says " This deficiency is frequently caused by a deficiency in the active form of vitamin D".

So for here I inferred that there are cases in which Calcium deficiency is caused by something else.

Now, since an assumption is a must be true statement when I negate option A I have a valid scenario in which milk does not contain vitamin D or other substances.

Can anyone shed light on this one?
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Akela
Physician: The rise in blood pressure that commonly accompanies aging often results from a calcium deficiency. This deficiency is frequently caused by a deficiency in the active form of vitamin D needed in order for the body to absorb calcium. Since the calcium in one glass of milk per day can easily make up for any underlying calcium deficiency, some older people can lower their blood pressure by drinking milk.

The physician’s conclusion is properly drawn if which one of the following is assumed?

(A) There is in milk, in a form that older people can generally utilize, enough of the active form of vitamin D and any other substances needed in order for the body to absorb the calcium in that milk.

(B) Milk does not contain any substance that is likely to cause increased blood pressure in older people.

(C) Older people’s drinking one glass of milk per day does not contribute to a deficiency in the active form of vitamin D needed in order for the body to absorb the calcium in that milk.

(D) People who consume high quantities of calcium together with the active form of vitamin D and any other substances needed in order for the body to absorb calcium have normal blood pressure.

(E) Anyone who has a deficiency in the active form of vitamin D also has a calcium deficiency.

The argument is as follows-
1) The rise in blood pressure that commonly accompanies aging often results from a calcium deficiency
2) Deficiency is caused frequently by absence of Vitamin D which is required for absorption of calcium
Conclusion- some older people can lower their blood pressure by drinking milk.(Since calcium in one glass of milk can make up for deficiency)

But clearly there is a logical gap here- even if drinking milk can make up for calcium deficiency what about the vitamin D which is required to absorb calcium
without vitamin D there is no use of drinking milk
A) is clearly filling that gap by saying vitamin D is also present in milk which will make drinking milk effective(Vit D + Calcium)
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