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this is too easy!!
, j( o  ~% b; h; b0 T/ j( L! y4 O公仔箱論壇
9 M0 y; {6 c2 r! ~9 j4 h1. put 6 at each side.. take the one side which is heavier: ]% Z7 n. T  ?6 v5 E1 D
2. put 3 at each side.. also take the heavier side
4 T, s4 a! e7 O, [3. put 1 at each side.. if the weight balance then the one not put inside is the heavy ball.. else the side which is heavier is the heavier ball..
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