## how do you diagram this?

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lakers3peat

Posts: 464
Joined: Thu Sep 16, 2010 7:10 pm

### how do you diagram this?

flawed reasoning question:

No member of Orchestra Google is a singer and a dancer. Since James and Paul are both members of Orchestra Google but neither is a dancer, it follows that both are singers.

typ3

Posts: 1362
Joined: Sun Feb 28, 2010 12:04 am

### Re: how do you diagram this?

If MOG --> *S&D

If S&D ---> *MOG

J&P --> MOG

J&P ---> *D

Therefore J&P--> S

In my opinion you shouldn't need to diagram this flaw on a LR section. It's a pretty egregious error.

The stimulus says that if you're in the orchestra you can't sing and dance. However, just because you don't sing and dance doesn't mean you can't do a 3rd option. Perhaps you're in the orchestra and you play the Kazoo or Play the Electric washboard.

The stimulus says, because the two people aren't dancers they must be singers. We know this is a flaw because our original logical statement didn't say that members must be one or the other, rather they can't be both together.

Jeffort

Posts: 1888
Joined: Wed Jun 18, 2008 4:43 pm

### Re: how do you diagram this?

I reaffirm typ3's analysis.

The conditional premise establishes that ZERO individual members of the Google Orchestra group are both singers and dancers. Therefore the rule simply dictates that a member cannot be BOTH of those things, thus leaving open the possibility that members can be one or the other or NEITHER of those two things.

In short form logical talk the condition establishes NOT BOTH but does not dictate/require that a member has to be either (at least one) of the two. It allows a member to be neither a singer nor a dancer, which can be paraphrased as NOT EITHER/neither.

JazzOne

Posts: 2980
Joined: Tue Sep 09, 2008 11:04 am

### Re: how do you diagram this?

False dichotomy flaw. Don't diagram it.

toolfan

Posts: 151
Joined: Fri Oct 30, 2009 4:11 pm

### Re: how do you diagram this?

Yeh, this is something you'll have to pick up, quickly. don't waste time diagramming this.

No reversible error. judgment affirmed.

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