An air traveler in Beijing cannot fly to Lhasa without first flying to Chengdu. Unfortunately, an air traveler in Be...

Meredith August 15, 2019

Eliminating A

It seems that answer choice A also follows the transitive property, is the reason we eliminate it due to the fact it has an "or" condition? Thanks.

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shunhe January 6, 2020

Hi @Meredith, that's definitely part of it. I would also say that "anthroxine" in the answer choice plays the role of "Chengdu" in the first part of the answer choice, and we can see that this isn't kept parallel either. Hope this helps.

Valentina July 22, 2020

Hi @Shunhe, I eliminated A because just because someone has taken prozine, doesn't mean that they've taken anthroxine. Does this work?

shunhe July 28, 2020

Hi @Valentina,

Thanks for the question! That actually doesn’t work, since we’re told in the answer choice (A) that “a doctor can’t prescribe porozine without first prescribing anthroxine.” That means you have to had to have had anthroxine before you can get porozine. We would diagram this

~Anthroxine —> ~Porozine

Or the contrapositive ?
Porozine —> Anthroxine

So if you’ve had porozine, you’ve definitely had anthroxine.

Hope this helps! Feel free to ask any other questions that you might have.