Tree Problem

Replace the question mark with the correct number below.

Tree Problem




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Two old friends, Jack and Bill, meet after a long time.

Three kids
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Jack: Oh, now I get it.

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Math Equation Picture

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Amazing Facts

Gamers

In 2011, people playing Foldit, an online puzzle game about protein folding, resolved the structure of an enzyme that causes an Aids-like disease in monkeys. Researchers had been working on the problem for 13 years. The gamers solved it in three weeks.