4 times are enough for 42 balls, you need 5 times.

jinjing · 2010-05-02 14:12:59Z

4 times are enough for 42 balls, you need 5 times.简介

来源: jinjing 于 2010-05-02 14:12:59 [档案] [旧帖] [给我悄悄话] 阅读数 : (168 bytes)

回答: 用天平称39个乒乓球由 Blue_Diamond 于 2010-05-01 21:01:19

Welcome back.I also want quit,but I can't.Your formula are quite good,but can improve.If 3 times were not enough for 13 balls,I would be totally wrong.Have a nice day.

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