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Actually - do they do this in LLM benchmarks? As a measure of overconfidence/confabulation? Seems immediately applicable.
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"incomplete information" is a standard concept in word problem curriculum. But usually it's explicitly an option in the test, as a fairness to the student.

Making mistakes in lecture is a standard technique used by good teachers, to promote active listening and critical thinking.

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I didn't see that in the document. What page is it on?
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I think they mean at the bottom of p216 (pdf page 4), where he says he doesn't know, r+s=80 but there isn't enough information to solve for r and s.
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There's two questions that are intended to be wrong (probably to test confidence). One with insufficient information and where the question itself implies falsehoods.
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The questions are on page 215 (3/26) and Tao's answers are on the next page.
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