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You have to test a pill for its effectiveness. You have 100 pills and 100 sugar cubes looking like pills. How would you design an experiment for this test?

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do a 200 person randomly selected double blind test...

But not sure I would call this a brain teaser

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do a 200 person randomly selected double blind test...

But not sure I would call this a brain teaser

Agreed. Even if the point is that we don't know which pills are sugar and which pills are real, the double-blind test with 200 people will still prove the effectiveness by the number of participants who show the desired effects of the real pill.

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