2017 LRB page 192-193

[Stephanie Oswalt]

We recently received the following question from a student:

Hi,
I'm on the 2017 edition of the logical reasoning bible. I'm wondering if on page 192-193 there is a typo. I'm not understanding why when referring to the PCE when the environment is able to support life why there is still the negative or negating mark through the symbol. It's quite confusing as I thought I was understanding this concept.
Thank you for your help and clarification.
Allison

An instructor will respond below. Thanks!

[Dave Killoran]

Hi,

Thanks for the question! There is not an error there, fortunately However, it is a tricky set of statements, and thus this question has come up before. For starters, please check out the following two discussions:

• lsat/viewtopic.php?t=10839
  
  and
  
  lsat/viewtopic.php?t=1868

If you have questions afterwards, just let me know and we can talk about it in more detail. Thanks!