Divide 3 groups first.
! {2 T5 Q4 f5 P& H. e公仔箱論壇i.e. 4 x 4 x 4.
/ u& a) B: \/ i# z! zWeight any 2 groups [1st]
; M N- U Z" T0 K; D$ _3 Zthen you will know the heavier ball in which group." y) F6 P0 i" r+ u2 k1 D
Weight any 2 balls in that group [2nd]5.39.217.773 i$ g* U/ U4 \4 y- x0 y) o, t
then you will know the heavier ball in which 2 balls.4 N4 R4 |2 y0 {" ~. K
Repeat again in remainders [3rd]3 P" ?& w' Y) \" X* [. b
Got the heavier ball. |
發表於 2009-7-2 12:48 PM
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