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Clarifying Conditional Statements

 EPerryRyan
  • Posts: 1
  • Joined: Mar 21, 2017
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-  Tue Mar 21, 2017 8:53 pm #33596
Hello,

I am using PowerScore LSAT Logic Games Bible 2017 Edition, focusing on page 55. Why is the answer for number 3 invalid? I thought the reasoning was that if a sufficient condition occurs, you automatically know that the necessary condition also occurs, every time. Can you please explain?

Thank you! :)
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 Dave Killoran
PowerScore Staff
  • PowerScore Staff
  • Posts: 5852
  • Joined: Mar 25, 2011
|
-  Wed Mar 22, 2017 12:14 pm #33599
Hi EPerry,

Thanks for the question! Take close look at #3: it says that John did not receive and A+, so in this case the sufficient condition did not occur. Thus, to conclude that the necessary also did not occur is an error.

Does that help? Please let me know. Thanks!
 Return to “LGB Chapter 3”

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