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26 Mar 2020, 01:26
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
69% (01:53) correct
31%
(02:04)
wrong
based on 632
sessions
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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
(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
26 Mar 2020, 06:16
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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.
Quote:
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.
Quote:
This is the correct answer per the reasoning above.
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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.
Quote:
Irrelevant to the argument above since the conclusion of the argument is not dependent on the storage of information about every person's retina.
Quote:
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.
Quote:
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.
26 Mar 2020, 07:00
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Quote:
ARGUMENT
[p] no two eyes have the same retina pattern;
[c] retina scanners can determine whether ANY person has been scanned before;
[as] 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.
