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After a psychophysics test, each of the twenty-five students in the class looked at the teacher's gradebook. Each student saw five A's. Nobody saw all the grades and nobody saw his or her own grade. What is the minimum number of students with an A on this test?

 Nov 22, 2020
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20 people that perhaps didn't get an A can look and see 5 As that aren't theirs

   The remaining 5 people would require 6 As to avoid seeing theirs

so....    6

 Nov 24, 2020

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