The retina scanner, a machine that scans the web of tiny blood vessels

Question

Competition Mode Question

The retina scanner, a machine that scans the web of tiny blood vessels in the retina, stores information about the pattern formed by the blood vessels. This information allows it to recognize any pattern it has previously scanned. No two eyes have identical patterns of blood vessels in the retina. A retina scanner can, therefore, be used successfully to determine for any person whether it has ever scanned a retina of that person before.

The reasoning in the argument depends upon assuming that

The reasoning in the argument depends upon assuming that

(A) diseases of the human eye do not alter the pattern of blood vessels in the retina in ways that would make the pattern unrecognizable to the retina scanner

(B) no person has a different pattern of blood vessels in the retina of the left eye than in the retina of the right eye

(C) there are enough retina scanners to store information about every person’s retinas

(D) the number of blood vessels in the human retina is invariant although the patterns they form differ from person to person

(E) there is no person whose retinas have been scanned by two or more different retina scanners

eakabuah · Answer

A is the right answer.

Argument
Premise: The retina scanner, a machine that scans the web of tiny blood vessels in the retina, stores information about the pattern formed by the blood vessels. This information allows it to recognize any pattern it has previously scanned.
Premise: No two eyes have identical patterns of blood vessels in the retina. 
Conclusion: A retina scanner can, therefore, be used successfully to determine for any person whether it has ever scanned a retina of that person before.

What can possibly weaken this argument? What if due to aging or eye diseases contracted by a person whose retina has been scanned the patterns formed by the blood vessels in the retina change, would the retina scanner be successful in determining whether the retina of the person in question has already be scanned? Certainly not. So, it has to be assumed that the pattern formed by the blood vessels in the retina does not change due to the aging of the eye of a person and that eye diseases do not alter the patterns of formed by the blood vessels in the retina. Based on this, A is the right answer.

This is the correct answer per the reasoning above.

This doesn't have to be assumed as the left eye and right eye are different and the argument does not rely on the similarity between the pattern formed in the retina of the left eye and the pattern formed in the retina of the right eye.

Irrelevant to the argument above since the conclusion of the argument is not dependent on the storage of information about every person's retina.

The argument is not about the number of blood vessels in the human retina but rather about the unique patterns formed by the blood vessels in the human retina. D is incorrect.

Irrelevant to the conclusion. A person's retina can be scanned by as many retina scanners as possible, as long as the conclusion made to the argument above holds.

exc4libur · Answer

ARGUMENT
  no two eyes have the same retina pattern;
  retina scanners can determine whether ANY person has been scanned before;
  assuming the pattern never changes!

Ans (A) if diseases alter the pattern of the retina, then, a person who has been scanned before, will not be recognized by the scanner, thus the argument falls.

unraveled · Answer

The retina scanner, a machine that scans the web of tiny blood vessels in the retina, stores information about the pattern formed by the blood vessels. This information allows it to recognize any pattern it has previously scanned. No two eyes have identical patterns of blood vessels in the retina. A retina scanner can, therefore, be used successfully to determine for any person whether it has ever scanned a retina of that person before.

The reasoning in the argument depends upon assuming that

The reasoning in the argument depends upon assuming that

Conclusion: Data of a pattern of a person's eye can be used to successfully determine whether that person has ever been scanned.

(A) diseases of the human eye do not alter the pattern of blood vessels in the retina in ways that would make the pattern unrecognizable to the retina scanner - WRONG. Might be a good point but irrelevant.

(B) no person has a different pattern of blood vessels in the retina of the left eye than in the retina of the right eye - WRONG. Right or left eye are not discussed. It might be a second line of assumption.

(C) there are enough retina scanners to store information about every person’s retinas - CORRECT. If there is a database of scanned eyes then it can be used to check whether the person was scanned earlier.

(D) the number of blood vessels in the human retina is invariant although the patterns they form differ from person to person - WRONG. Already covered in the argument.

(E) there is no person whose retinas have been scanned by two or more different retina scanners - WRONG. Out of scope.

IMO Answer C.

madgmat2019 · Answer

P-The retina scanner, a machine that scans the web of tiny blood vessels in the retina, stores information about the pattern formed by the blood vessels. 
P-This information allows it to recognize any pattern it has previously scanned.
P-No two eyes have identical patterns of blood vessels in the retina. 
C-A retina scanner can therefore be used successfully to determine for any person whether it has ever scanned a retina of that person before.

(A) diseases of the human eye do not alter the pattern of blood vessels in the retina in ways that would make the pattern unrecognizable to the retina scanner.....if the diseases might have changed the pattern then the conclusion of retina scanner successfully determining the scanning history of retina will be incorrect....so this helps in reasoning the conclusion......INCORRECT

(B) no person has a different pattern of blood vessels in the retina of the left eye than in the retina of the right eye....This is not going to help us in determining the conclusion....INCORRECT

(C) there are enough retina scanners to store information about every person’s retinas..........OUT OF CONTEXT....INCORRECT

(D) the number of blood vessels in the human retina is invariant although the patterns they form differ from person to person.........its not about the no.of blood.....its about the scanner recognizing the pattern....INCORRECT

(E) there is no person whose retinas have been scanned by two or more different retina scanners......OUT OF SCOPE.....INCORRECT

OA:A

Ranforce7 · Answer

It’s simple argument, I see it’s one of lsat.

In A if we negate the assumption conclusion will be destroyed while in b it doesn’t do anything to our conclusion..

For assumption/strengthened questions we tend to choose option that totally destroys our conclusion.

Cheers

Posted from my mobile device

Ranforce7 · Answer

It’s simple argument, I see it’s one of lsat.

In A if we negate the assumption conclusion will be destroyed while in b it doesn’t do anything to our conclusion..

For assumption/strengthened questions we tend to choose option that totally destroys our conclusion.

Cheers

Posted from my mobile device

GMAT0010 · Answer

The only possible way for the proposal to work is to ensure that there are no other factors undermining the proposal.
So if one has a pattern A34 ,but due to a disease , the pattern gets changed to B34, but the scanner recognises A34 but not B34 ,then the plan falls apart.
I am not a doctor, so please take the example with a grain of salt

Hope this helps!

vasu1104 · Answer

Conclusion- retina scanner can be used to determine whether it has ever scanned a retina of that person before. 
 reason- retina stores infor about the pattern formed by blood vessels 
 that info helps to recognize any previous pattern it scanned. 
 no two eyes have identical patterns of blood vessels in that retina.

A. perfect. if the diseases does alter the pattern then scanner cant determined a preivous retina of person 
 B difference in left or right eyes is not big problem. 
 C irrelevant 
 D number of blood vessel is not concern 
 E how may scanners have been use to scan is not relevant to topic.

The retina scanner, a machine that scans the web of tiny blood vessels

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