标有"A","B","C","D","E"的小球各10个,至少有抽多少个球,才保证其中至少有两个字母相同的小球?

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标有"A","B","C","D","E"的小球各10个,至少有抽多少个球,才保证其中至少有两个字母相同的小球?标有"A","B","C","D","E"的小球各10个,至少有抽多少个球,才保证其中至

标有"A","B","C","D","E"的小球各10个,至少有抽多少个球,才保证其中至少有两个字母相同的小球?
标有"A","B","C","D","E"的小球各10个,至少有抽多少个球,才保证其中至少有两个字母相同的小球?

标有"A","B","C","D","E"的小球各10个,至少有抽多少个球,才保证其中至少有两个字母相同的小球?
6.至少 .