Conditional question concerning A->B->C

Posts: 31
Joined: Mon Mar 19, 2012 8:46 pm

Conditional question concerning A->B->C

Postby CREATION » Sun Apr 01, 2012 9:53 pm

If the conditional is:


Can that also be seen as:


Are you allowed to flip and negate within a conditional. It seems that those 2 statements are equivocal.

I personally do not believe that it is valid.

I know the contrapositive is to fully reverse and negate, but I just was curious.

Posts: 129
Joined: Wed Mar 15, 2006 5:12 pm

Re: Conditional question concerning A->B->C

Postby MLBrandow » Sun Apr 01, 2012 10:00 pm


You answer your own question with the statements you wrote. Writing a partial contrapositive yields A leading to both B and ~B, as well as C and ~C.

A=study hard
B=high LSAT
C=attend a top law school

Try substituting these in and see what happens.

User avatar
Posts: 400
Joined: Fri Oct 07, 2011 11:03 pm

Re: Conditional question concerning A->B->C

Postby LexLeon » Tue Apr 03, 2012 12:24 am


From the conditional chain

A -> B -> C

the following list exhausts all possible inferences, I think:

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

Return to “LSAT Prep and Discussion Forum”

Who is online

Users browsing this forum: Exabot [Bot], PrezRand and 5 guests