A valid argument is often defined as one in which it is not possible for all the premises to be true and the conclusion false. A circular argument is sometimes defined as one in which one of the premises is identical to the conclusion. From these definitions we can infer that…
A. Every circular argument is valid as long as its premises are true.
B. Every valid argument is circular.
C. No circular argument is valid.
D. Some circular arguments are valid, and some are not.
E. Some circular arguments are not valid, and some valid arguments are not circular.
D
D. Some circular arguments are valid, and some are not.
we must not use our own knowledge and rely only on information given.
if we think logically, as statement given are true logical definition of
valid and circular arguments, C is always right. we KNOW that circular
arguments are ALWAYS wrong in logic. so that rules out D & E. but we must not use “logic” but just the statements given. from the tatements only, also, we can rule out D & E. because whatever info is given helps us make decision in “yes or no”. there is no scope for “some yes and some no”. but we don’t know C is true only from the statements given. B is obviously wrong, both from common sense logic and information given. A is only option consistent with both the statements.
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Dear Vinay,
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BTW what is ur answer ?
My guess – D.
Because it says that circular argument SOMETIMES has 1 premise same as its conclusion, and since valid arguments are OFTEN defined as having true premises and true conclusions, we can easily infer that SOME circular arguments are valid, some may not be because the argument is only talking “sometimes circular arguments….”
A
E
MY OPTION IS E
Correct answer is A.
So, GMAT Team, tell me why the premises for circular arguments must be true in order for it to be valid? I would think that circular arguments would ALWAYS be valid because if their premises are true than the conclusion is true.
I dont think its A…If one of the premises is true, does’nt mean that it is valid coz the conclusion could be false..
I would go with D
D
Dear GMAT TEAM…In circular argument it says that SOMETIMES that means the ans A does not go with the definition given…Thanx
it is A.
Logic is A valid argument is often defined as one in which it is not possible for all the premises to be true and the conclusion false.
This means that for valid argument if all premises to be true then conclusion is always true.
Now switch to second part :-
A circular argument is sometimes defined as one in which one of the premises is identical to the conclusion. This means that ( applying first logic) if all premises in circular argument is valid then conclusion which is one of the premises is also valid or argument is valid.
Same is stated by A. I agree E. Some circular arguments are not valid, and some valid arguments are not circular stands good on its own but not within scope of argument
D
A valid argument is often defined as one in which it is not possible for all the premises to be true and the conclusion false
Thus if all the premises are true, for it to be a valid argument the
conclusion must be true.
Now, A circular argument is sometimes defined as one in which one of the premises is identical to the conclusion.
Thus for a circular argument if the premises be true, it must be valid… Thus A
A…
D. Some circular arguments are valid, and some are not.
A
A
It’s A: one can get this answer by making a Venn Diagram, should be much simpler…
It will reveal that all circular arguments are valid arguments.. i.e. either premises and conclusions touch each other tangentially or with a bit more coinciding area… “ATLEAST”
The diagram for Valid arguments would show True and false overlapping and also Premises and conclusions overlapping to an extent..
A all the way
I will go with option D