Well I guess my bias was positive integers, but still ended up with the correct rule (their confirmation) -- 3 yes then one no before I committed.
Some yes answers are just as good at defeating confirmation bias as no questions. Just trying 1, 2, 3 is enough to convince you that the doubling rule is wrong.
We also make some assumptions about how complex the rule is likely to be. I did not try any decimal numbers or negative numbers. I did use zero.
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