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  • Posts: 4
  • Joined: Feb 25, 2021
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: 1787
  • Joined: Dec 06, 2013
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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