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JUSTKRISH
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surajs838
https://gmatclub.com/forum/v02-184806.html
For this question, the argument says "stage-4 sleep" is essential. Doesn’t that imply it is a necessary condition and not sufficient condition. The correct answer which is ’A’ doesn’t seem to fit here.

Can someone help me with the reasoning?
I guess the concept here is - Something is essential only when the result cannot be obtained without it. So when option 1 says "Only stage-4 sleep can restore substance P to its normal, non-sensitizing level" this means Stage 4 sleep is essential for restoring substance P. Which is the conclusion, thus, Option becomes an assumption. Also, If we negate Option A -> "Not Only stage-4 sleep can restore substance P to its normal, non-sensitizing level" this means there are other things that can bring the chemical to its normal level -> getting sufficient stage-4 sleep is "not" essential to preventing fibromyalgia as there are other options too -> Thus, it failed the conclusion, statement no longer holds. Thus Option 1 is necessary assumption.
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one-of-the-effects-of-lead-poisoning-is-an-inflammation-of-the-optic-n-126675.html Can someone explain A using negation and tell me how its weaking?
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Which prep company's sectionals for Verbal, Quant, and DI should one buy to analyze their current score position?
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chloreton
https://gmatclub.com/forum/one-of-the-effects-of-lead-poisoning-is-an-inflammation-of-the-optic-n-126675.html Can someone explain A using negation and tell me how its weaking?
The flow of the question is : lead poisoning leads to inflammation of optic nerve —-> bright halo around light sources.

Sunflower painting used Naples yellow, which contains lead. Van Gough ingested it. Lead poisoning as a reason is put forth.

Later paintings - Van gough painted bright haloes around sun and stars. So, it’s highly likely (greater probability) that the paint must have been ingested by Van Gough.

The last italics part demonstrates the conclusion.

We cannot change the premise. So, if Van Gough has painted haloes around light sources. Then he must have ingested the paints, leading to lead poisoning.

What if, the conclusion is false. So, no paint ingestion by Van Gough. But, still van gough paints picture with bright haloes. May be he draws what he sees. He is gifted to see what others don’t see. Or may be the vision is distorted post accident or birth defects. Then the conclusion fails. So, the entire narrative of paint ingestion and lead poisoning falls apart.
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Thanks for the explanation, but still, I get the conclusion is " it is likely that he was suffering from lead poisoning caused by ingesting the pigments he used becos later paintings contained bright haloes around sun and star" Option A mentions "In Van Gogh’s later paintings he painted some things as he saw them." If he painted what he saw, doesnt that directly weaken the fact that LEAD poisoning aint the reason.?
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Yes the conclusion of lead poisoning as the cause for the painting falls out

So there is no doubt on the bright halo. Is the cause of bright halo lead or something else ? Since the initial statement mentions as optical nerve inflammation we are forced to think and link the dots. Moreover, does the inflammation of optical nerve lead to bright halo paintings? Yes.
The question is are these two facts linked ! ? The linking part is the paint ingested. To break it , bring something else to the table to weaken it
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oh okay i get it now. This one was quite different from other assumption question.

Thanks Dereno!
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Quote:

*chloreton writes:*
oh okay i get it now. This one was quite different from other assumption question.
+1
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Some say that its okay to miss 2-3 hard questions, how many questions can I skip to be able to score 700+ comfortably? Or shall I be solving all the questions like my life depend on it?
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How do you solve these type of questions within time, my approach is to create an equation and then solving, but creating the equation alone takes 1-1:30 minutes, Is it a good idea to by hard some of the tricks?
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WA@mfy6400
Hi everyone, I can answer most RC questions, but ‘main purpose’ takes time because I try to understand the whole passage.

Any tips to do this faster? What works for you?
I think you will get the time right once you have done enough practice. Practice more and just try to read once, then take your eyes off the screen and tell yourself what is it that you just read, what sense does it make? Why did the author write it? Try not to look at at the question while making the mind map, look away from the screen. You need not tell yourself exactly what the purpose is if you think you know it when you look away from the scree.

WA@ttq6357
What kina ques, you mean algebra and all?
Oh I didn’t paste the question URL, my bad. here - victoria-travels-120-kilometers-at-a-constant-speed-and-455896.html
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ohh, I see, But then how do you decide when to substitute numbers Vs going for equations?
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