## WFT? One statement contains, "If, either, or" HELP!

Prepare for the LSAT or discuss it with others in this forum.
youknowryan

Posts: 181
Joined: Mon Aug 18, 2008 3:20 am

### WFT? One statement contains, "If, either, or" HELP!

This one threw me for a loop since it has three indicators in it.

It is clear that if Bob's dismissal was justified, then he was either incompetent or late.

Do I treat it like a standard "or" statement?

dismissal justified -> late or incompetent

Or do I treat it like an either/or statement?

not incompetent (dismissal not justified) -> late (dismissal justified)

not late (dismissal not justified) -> incompetent (dismissal justified)

I am leaning toward the second option. Thoughts?

ziggie

Posts: 121
Joined: Sun Jun 27, 2010 11:29 pm

### Re: WFT? One statement contains, "If, either, or" HELP!

dismissal justified -> late or incompetent

or you can also write it as

not late AND not incompetent -> dismissal NOT justified

youknowryan

Posts: 181
Joined: Mon Aug 18, 2008 3:20 am

### Re: WFT? One statement contains, "If, either, or" HELP!

Any one able to confirm this? THe "either" part is what still has my attention.

kilgoretrout103

Posts: 37
Joined: Sat Oct 09, 2010 5:34 pm

### Re: WFT? One statement contains, "If, either, or" HELP!

Ziggie is right.

Formal logic:

-J -> (I v L)

Contrapositive:

(-I & -L) -> J

J = Bob's dismissal was justified
I = incompetent
L = late

And "v" is a vel meaning "or."

EDIT: "Either" still means "one or the other, or both." Every "or" on the LSAT is inclusive, unless they explicitly say "This and that and not both."

youknowryan

Posts: 181
Joined: Mon Aug 18, 2008 3:20 am

### Re: WFT? One statement contains, "If, either, or" HELP!

kilgoretrout103 wrote:Ziggie is right.

Formal logic:

-J -> (I v L)

J = Bob's dismissal was justified
I = incompetent
L = late

-J = justified or NOT justified?

kilgoretrout103

Posts: 37
Joined: Sat Oct 09, 2010 5:34 pm

### Re: WFT? One statement contains, "If, either, or" HELP!

"-J" means "not justified."

cubswin

Posts: 617
Joined: Mon May 25, 2009 4:40 pm

### Re: WFT? One statement contains, "If, either, or" HELP!

youknowryan wrote:
kilgoretrout103 wrote:Ziggie is right.

Formal logic:

-J -> (I v L)

J = Bob's dismissal was justified
I = incompetent
L = late

-J = justified or NOT justified?

kilgoretrout103 wrote:"-J" means "not justified."

I assume Kilgore rushed through this, since he correctly said that Ziggie was right. But the statement was "If Bob's dismissal was justified, then he was either incompetent or late." This making his symbolization (starting with ~J) incorrect. It should be

J --> I v L