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23 Aug 2018, 06:50
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Selena claims to have psychic powers. So if we find out whether Selena's claim is true, we will thereby determine whether it is possible to have psychic powers.
The conclusion drawn above follows logically if which one of the following is assumed?
A. No one else has yet been found to have psychic powers.
B. If it is possible to have psychic powers, then Selena has them.
C. It is possible to determine whether Selena has psychic powers.
D. If Selena's claim turns out to be false, we will not know whether it is possible to have psychic powers.
E. We will not be able to determine whether it is possible to have psychic powers unless we find out whether Selena's claim is true.
The conclusion drawn above follows logically if which one of the following is assumed?
A. No one else has yet been found to have psychic powers.
B. If it is possible to have psychic powers, then Selena has them.
C. It is possible to determine whether Selena has psychic powers.
D. If Selena's claim turns out to be false, we will not know whether it is possible to have psychic powers.
E. We will not be able to determine whether it is possible to have psychic powers unless we find out whether Selena's claim is true.
LSAT
Selena claims to have psychic powers. So if we find out whether Selena's claim is true, we will thereby determine whether it is possible to have psychic powers.
The conclusion drawn above follows logically if which one of the following is assumed?
Pre-Thinking:
The argument boils down to: if we find out whether Selena’s claim to have psychic powers is true or not, we will know whether it’s possible to have psychic powers. This argument can conclusively establish that psychic powers exists, if selena has psychic powers. If we can demonstrate that selena's claim is false, we only establish the absence of psychic power in this instance not in general. It cloud still be possible to have them even if selena doesn't. So the assumption must establish that if selena doesn't have psychic power, no one else can possibly have them.
A. No one else has yet been found to have psychic powers. This doesn't rule out that none else can have them
B. If it is possible to have psychic powers, then Selena has them. This establishes selena as the perfect candidate to have psychic powers. If it's possible she has them. If she doesn't then they are impossible to have.
C. It is possible to determine whether Selena has psychic powers. It could be impossible to determine whether Selena has psychic powers and the argument still remains true that if it were possible, we would know whether it is possible to have psychic powers.
D. If Selena's claim turns out to be false, we will not know whether it is possible to have psychic powers. This is is the reverse of what the argument wants to establish.
E. We will not be able to determine whether it is possible to have psychic powers unless we find out whether Selena's claim is true. This does nothing to resolve the issue that Selena not having psychics powers does not prove that they are impossible, unless it is a given that she would have them if they were possible.
ANS : B
The conclusion drawn above follows logically if which one of the following is assumed?
Pre-Thinking:
The argument boils down to: if we find out whether Selena’s claim to have psychic powers is true or not, we will know whether it’s possible to have psychic powers. This argument can conclusively establish that psychic powers exists, if selena has psychic powers. If we can demonstrate that selena's claim is false, we only establish the absence of psychic power in this instance not in general. It cloud still be possible to have them even if selena doesn't. So the assumption must establish that if selena doesn't have psychic power, no one else can possibly have them.
A. No one else has yet been found to have psychic powers. This doesn't rule out that none else can have them
B. If it is possible to have psychic powers, then Selena has them. This establishes selena as the perfect candidate to have psychic powers. If it's possible she has them. If she doesn't then they are impossible to have.
C. It is possible to determine whether Selena has psychic powers. It could be impossible to determine whether Selena has psychic powers and the argument still remains true that if it were possible, we would know whether it is possible to have psychic powers.
D. If Selena's claim turns out to be false, we will not know whether it is possible to have psychic powers. This is is the reverse of what the argument wants to establish.
E. We will not be able to determine whether it is possible to have psychic powers unless we find out whether Selena's claim is true. This does nothing to resolve the issue that Selena not having psychics powers does not prove that they are impossible, unless it is a given that she would have them if they were possible.
ANS : B
General Discussion
23 Aug 2018, 11:15
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Confusing question, the age old negation method fails here.
Considering, 'So if we find out whether Selena's claim is true, we will thereby determine whether it is possible to have psychic powers.' as the conclusion under scrutiny.
A. No one else has yet been found to have psychic powers.
A can be correct. Since if someone already has psychic powers then finding out if Selena's claim is true does nothing about our ability to say whether psychic powers exist. If we negate A, we get that someone has psychic powers, so Selena's whole role in the argument/conclusion falls apart. We no longer need to determine Selena's claim to figure out if psychic powers are real. This assumption is essential to our argument.
B. If it is possible to have psychic powers, then Selena has them.
B can't be correct. Negating it we get something awkward. Selena has psychic powers and psychic powers are possible.
How I came to this?
https://www.math.niu.edu/~richard/Math101/implies.pdf
See page 3, example 5.
How is this hurting the argument?
C. It is possible to determine whether Selena has psychic powers.
Here in the stem, the conclusion is in the 'if..., then..' format. So this is not an assumption that affects the argument in anyway. Irrespective of our ability to determine Selena's ability, we can still make the argument that if we manage to gauge the ability then a certain thing will happen(in this case psychic powers will be proven)
Rest of the 2 are self explanatory.
Considering, 'So if we find out whether Selena's claim is true, we will thereby determine whether it is possible to have psychic powers.' as the conclusion under scrutiny.
A. No one else has yet been found to have psychic powers.
A can be correct. Since if someone already has psychic powers then finding out if Selena's claim is true does nothing about our ability to say whether psychic powers exist. If we negate A, we get that someone has psychic powers, so Selena's whole role in the argument/conclusion falls apart. We no longer need to determine Selena's claim to figure out if psychic powers are real. This assumption is essential to our argument.
B. If it is possible to have psychic powers, then Selena has them.
B can't be correct. Negating it we get something awkward. Selena has psychic powers and psychic powers are possible.
How I came to this?
https://www.math.niu.edu/~richard/Math101/implies.pdf
See page 3, example 5.
How is this hurting the argument?
C. It is possible to determine whether Selena has psychic powers.
Here in the stem, the conclusion is in the 'if..., then..' format. So this is not an assumption that affects the argument in anyway. Irrespective of our ability to determine Selena's ability, we can still make the argument that if we manage to gauge the ability then a certain thing will happen(in this case psychic powers will be proven)
Rest of the 2 are self explanatory.
