divde the 12 balls into 3 sets of 4. 公仔箱論壇6 `( h, D. r6 k1 l9 ]" j$ I+ E
weight any 2 sets.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。6 d4 U/ S/ Y# W, ?# f4 f% i
if the 2 sets are equal, then you know the heavy one is in the third! d5 j! ]1 k+ J: S# a* y6 i, [% `
if one of the 2 is heavier, then the heavy one is in that set5.39.217.77' ?# R) n: @( X) m `3 R* J
then divide the 4 balls into 2.
/ P. N# H* r7 Y* D/ |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。weigh them
( \! G* Q- u& H/ x! C7 h8 Vand divide the heavier into 1
6 |- Y* m; V/ n G( z" R5.39.217.77and weight them.) E( Q6 J/ x- I0 N4 |
3 x weighing and get the ans.
. \# L- d7 }4 a* n2 J9 w公仔箱論壇in less than 15 secs. |