PT24.S2.Q21 - newspaper editor: law enforcement experts

MoosaderMoosader Alum Member
edited January 2016 in Logical Reasoning 234 karma
Obvi not C, D, E.

Need help on making A and B distinct. Need a strategy on how to decode the false double negative on all LSAT wording. Need help on answering the question. Thanks

A. No effective law is unenforceable
B. All enforceable laws are effective


  • DumbHollywoodActorDumbHollywoodActor Alum Inactive ⭐
    7468 karma
    "No" is a group 4 (negate necessary) so whichever condition you make necessary must be negated: all effective laws are enforceable or all unenforceable laws are ineffective. Any way you slice it, they are clearly different from "all enforceable laws are effective."
  • bSM45LSATbSM45LSAT Member
    522 karma
    No effective law is unenforceable. If you assume this, then yes you can say that when a law fails to be effective, it should not be a law, BECAUSE no effective law is unenforceable (or translate with lawgic to all effective laws ARE enforceable).

    When I did this question I just read it instead of translating as it seemed to make more sense intuitively.
  • Matt1234567Matt1234567 Inactive ⭐
    1294 karma
    That question gave me a headache when I first encountered it a long time ago. But @DumbHollywoodActor nailed it. Follow J.Y's principle with negating necessary and negating sufficient when indicators kick in, and you should be fine.
  • c.janson35c.janson35 Free Trial Inactive Sage Inactive ⭐
    2398 karma
    Not sure if it would help, but if I ever freeze translating tricky "no" statements I always think of the example "No cats are dogs" because its translation into "if you are a cat, then you are not a dog" seems intuitive to me. It's just following the principle to negate the necessary, but sometimes a concrete example like this can do the trick to unfreeze me and keep me moving during timed practice.
  • MoosaderMoosader Alum Member
    234 karma
    Thanks to everyone :) I guess the real problem is that I haven't done 7sage yet. Just saying "negate necessary" saved me from so much pain. I didn't realize 7sage was so detailed, and right now, that's the detail I need. I am almost finished with the Trainer, and I am about to start PowerScore tomorrow. If things are still gnarly, I will be doing 7sage. But I already have these resources, so I might as well finish these first. Thanks again
  • ianrobertparkinsianrobertparkins Alum Member
    23 karma

    A. No effective law is unenforceable - This statement must be translated to All effective laws are enforceable. Then reverse and negate to get the contrapositive.

    Not Enforceable ----> - Effective

    We can feed this into our conditional statement in the passage. When - Effective ----> - Law

    we combine the two statements

    By combining, we see that if a law is not enforceable then it's not effective, we know from the passage if a law is not effective it should not be a law.

    Not Enforceable ----> Not Effective ------> Not Law

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