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huh?? How tough is it?
& g: Y" ]) l- }- Jtvb now,tvbnow,bttvb1/. break it down to 2 section, 6 balls on each side. Put which every section shows lighter awayTVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。  C8 j! k. Z- v) J" Q; O( ~' R: e
TVBNOW 含有熱門話題，最新最快電視，軟體，遊戲，電影，動漫及日常生活及興趣交流等資訊。  m! _. ^: D7 g) L. p
2/. Break the more heavy section in to 2 sections again, which is 3 balls on each side. Keep the more heavy side again.5.39.217.77:8898, X7 E" u5 C* n/ e
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3/. Pick 2 balls and put them on each side from the remaing 3 balls. If they are equal weight, the ball on the table is the more heavy one, if one side is more heavy than the other, that will be the more heavy one.5.39.217.77:88982 ]/ U) c  d: r  W3 M
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Easy. Tough question? For whom? I did it in 1 minute.