If we have the below If A -----> ~B ( not B ) which can : GMAT Critical Reasoning (CR)
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# If we have the below If A -----> ~B ( not B ) which can

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If we have the below If A -----> ~B ( not B ) which can [#permalink]

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22 Mar 2011, 08:04
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If we have the below

If A -----> ~B ( not B )

which can we infer

~A ------> B

OR

~B ---------> A

can some one explain the contrapositive or negation which is right and valid in GMAT CR
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22 Mar 2011, 08:31
In my opinion

B-------->~A
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22 Mar 2011, 09:20
'When A is true, B is true' - original

'converse' says 'when B is true, A is true'.

Contra positive is 'when B is not true, A is not true'.

I tried using this approach didn't work for me especially when it comes to super hard questions. You have to dissect the fluff immediately to see the skyline. Too formalistic approach being "algebraic" pays off after a lot of hard work. The other way is using critical reasoning in day to day life. Just use CR in any damn conversation - what is the assumption my friend made? What is the "must" be true in my friend's argument? What will I say to completely destroy the argument / to strengthen the argument? Is my friend making a realistic assumption. And so on Hope that helps.
Re: Clarification on Syllogism   [#permalink] 22 Mar 2011, 09:20
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