## PT 21 LR # 1, Q.20 (Ann and her leave of absence)

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icobes

Posts: 13
Joined: Thu Jul 23, 2009 4:05 pm

### PT 21 LR # 1, Q.20 (Ann and her leave of absence)

Can someone please explain this one to me?

Thanks so much.

dub

Posts: 73
Joined: Fri May 21, 2010 9:05 pm

### Re: PT 21 LR # 1, Q.20 (Ann and her leave of absence)

Brutal question.

Using Necessary -> Sufficient diagrams

Premises:
1)Leave of Absence -> Offered Fellowship
2)Quit -> Offered Fellowship
3)~Company finds out -> Allowed Leave of Absence (~Allowed Leave of Absence -> Company finds out)

Conclusion: Quit -> Company finds out.

If we assume D) Allowed Leave of Absence -> Leave of Absence + ~Quit (since she can only do one) then we have this chain starting with the contrapositive of our assumption (bold) and ending with the contrapositive of rule 3 (italicized).

Quit-> ~ Allowed Leave of Absence -> Company finds out.
Quit-> ~ Allowed Leave of Absence -> Company finds out.

And thus: Quit -> Company finds out.

icobes

Posts: 13
Joined: Thu Jul 23, 2009 4:05 pm

### Re: PT 21 LR # 1, Q.20 (Ann and her leave of absence)

Thank you! Much appreciated.