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Formal Logic inference drill #2

Questions and Answers related to our course homework and lessons.
 forumuser
  • Posts: 4
  • Joined: Feb 25, 2021
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-  Thu Feb 25, 2021 5:31 pm #84475
Why can no valid inference be drawn in this question? Doesn't the "at least one" clock provision mean "some", which entails reversibility?
 Robert Carroll
PowerScore Staff
  • PowerScore Staff
  • Posts: 1819
  • Joined: Dec 06, 2013
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-  Fri Feb 26, 2021 6:34 pm #84539
Hi forumuser,

If you mean that

..... clock :some: uses electricity

allows the inference

..... uses electricity :some: clock

Then that's true, but it's not an additive inference, it's an inherent inference. And these answer keys are looking for you to "draw as many additive inferences as possible."

Robert Carroll
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