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huh?? How tough is it?' F+ l1 S$ x9 E. n: V0 C
1/. break it down to 2 section, 6 balls on each side. Put which every section shows lighter away公仔箱論壇  v% ^3 U0 U( A0 {
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2/. Break the more heavy section in to 2 sections again, which is 3 balls on each side. Keep the more heavy side again.公仔箱論壇1 y/ }' f5 H7 m

; P  n: ^* j3 p4 ytvb now,tvbnow,bttvb3/. 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.
: }9 c/ S2 f) H+ |% h% a5 d5.39.217.76公仔箱論壇4 c2 X' Y/ B( A
Easy. Tough question? For whom? I did it in 1 minute.