Hey Guys,
Needed some help with diagramming a couple of sentences into lawgic and their contraceptives.
1. If Aliens or Ghosts are in the house, then Tim and John are not in the house...Is the info I have written below correct?
- The way I have diagrammed this is like: A or G --> /T and /J. Taken further, this becomes: A --> /T, A --> /J ; G --> /T, G --> J. If Aliens are in the house, then Tom is not there. If Aliens are in the house, then John is not there. If Ghosts are in the house, then Tom is not there. If Ghosts are in the house, then John is not there.
- Contrapositive: T or J --> /A and /G. Taken further, this becomes: T --> /A, T --> /G ; J --> /A, J --> /G. If Tom is in the house, then Aliens are not the house. If Tom is in the house, then Ghosts are not in the house. If John is in the house, then Aliens are not in the house. If John is in the house, then Ghosts are in the house.
2. Totally confused about diagramming "Tom will play really well for his soccer team if John or Bill, but not both, play on the same team as him."
I understand that John or Bill, but not both will be diagrammed as /J (--) B, where contrapositive is J (--) /B. But how do I diagram the info about Tom. Is this correct? /J (--) B --> T? If yes, what will be the contrapositive?
Thanks for your help, as always.
I actually didn't do any PrepTests and just sat for the Sept test to see how I would do (bad bad idea, I know). I found the LR sections to be pretty reasonable. A few questions here and there took some time, but I would say that they were of average difficulty. The first 3 LG questions were also not that hard, although I had to guess on two questions from the first 3 games...Computer Virus game was a different story. I am sure it wasn't hard but I panicked and guessed E for every question on that game (again, bad idea...I should have guessed C).
RC is where I totally bombed. I breezed through the first comparative passage but then screwed up hard on the Eileen Grey passage. That ruined my flow and I had to guess (E, again) for every question on the last passage.
All in all, I don't think that the test was too hard. You just gotta prep mentally that you will face at least one weird game on tests from now on. You just have to think them through and not panic, like I did.