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Can someone tell me if this is correct? This statement was

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bmwhype2
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Can someone tell me if this is correct? This statement was [#permalink] New post   31 Jul 2007, 05:01
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Can someone tell me if this is correct?

This statement was taken from this thread. https://www.gmatclub.com/phpbb/viewtopi ... c&start=20

All A's are B's means All B's are A's

I dont not think it makes sense if A is a subset of B.

In essence it is saying...

All humans are mammals
therefore mammals are humans.



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Re: Can someone tell me if this is correct? This statement was [#permalink] New post   31 Jul 2007, 05:42
bmwhype2 wrote:
Can someone tell me if this is correct?

This statement was taken from this thread. https://www.gmatclub.com/phpbb/viewtopic ... c&start=20

All A's are B's means All B's are A's

I dont not think it makes sense if A is a subset of B.

In essence it is saying...

All humans are mammals
therefore mammals are humans.


I agree it doesn't make sense. All A's are B's means that if something it A it is necessary that it is B. If something is B it is sufficient to be A.

Using the humans/mammals example:
If X is human then it must be a mammal. - necessary
If X is a mammal then it may be human- sufficient

On a side note, that's a great post...
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Re: Can someone tell me if this is correct? This statement was [#permalink] New post   31 Jul 2007, 20:18
If X is human then it must be a mammal. - necessary
If X is a mammal then it may be human- sufficient

It is the other way round...the first statement is sufficient and second is necessary.

All As are Bs.
Take an eg. All odd numbers are integers
but All Bs cant be As as all integers cant be odd.
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Re: Can someone tell me if this is correct? This statement was [#permalink] New post   14 Sep 2007, 08:09
yep, simple converse structure.

Conditional : A ==> B
Converse: B==> A

Not logically equivalent
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Re: Can someone tell me if this is correct? This statement was [#permalink] New post   14 Sep 2007, 09:12
vineetgupta wrote:
If X is human then it must be a mammal. - necessary
If X is a mammal then it may be human- sufficient

It is the other way round...the first statement is sufficient and second is necessary.

All As are Bs.
Take an eg. All odd numbers are integers
but All Bs cant be As as all integers cant be odd.


good job! that makes perfect sense.
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Re: Can someone tell me if this is correct? This statement was [#permalink] New post   14 Sep 2007, 09:59
bmwhype2 wrote:
Can someone tell me if this is correct?

This statement was taken from this thread. https://www.gmatclub.com/phpbb/viewtopi ... c&start=20

All A's are B's means All B's are A's

I dont not think it makes sense if A is a subset of B.

In essence it is saying...

All humans are mammals
therefore mammals are humans.


No, consider
A={1,2,3}
B={1,2,3,4,5}



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Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Critical Reasoning (CR) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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Re: Can someone tell me if this is correct? This statement was [#permalink]
14 Sep 2007, 09:59
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