Divide 3 groups first.
, z3 x$ }, P Z9 g. x* ]i.e. 4 x 4 x 4.
7 V6 h6 l8 b) G6 E( vWeight any 2 groups [1st]
# A% T3 D1 f% M& k, O0 Y4 D! A& sthen you will know the heavier ball in which group.
8 u1 X. J( l* C. CWeight any 2 balls in that group [2nd]
5 [. h7 d3 q h3 p4 lthen you will know the heavier ball in which 2 balls.
# s% W: G+ p# j. v7 gRepeat again in remainders [3rd]: V4 G2 q) N( ?
Got the heavier ball. |
發表於 2009-7-2 12:48 PM
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