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把和是50的兩數分為一組: (1、49) (2、48) (3、47) …… (24、26) 共24組,餘一個(25) 最壞情况:取完25這個,取完24組中每組1個數. 取到的數中沒有任何2個數的和為50. 根據抽屜原理,此時再多取1個,必有兩數來自同一組中,保證滿足題意. 囙此至少取24 + 1 +1 = 26個數
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