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SCHOOL TIME

Young math genius

作者:TEENS
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厉害了!美国数学竞赛冠军0.9秒内解出题目。

On a farm, 100 chicks sit quietly in a circle. Suddenly, each chick freely pecks (啄) the chick to its left or right. What is the expected number (数目) of unpecked chicks? Can you solve it? (See explanation at the end of the story.)
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