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Which of these numbers is least like the others: 2, 3, 5, 7, 8, 11, 13

Fact Lab

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Interesting fact:

Christopher Langan is another big name on the IQ scene. Dubbed “the smartest man in America,” Langan is said to have an IQ between 195 and 210! He tutored himself in advanced math, physics, philosophy, and Latin while at high school.