divde the 12 balls into 3 sets of 4. b b( I% d& {: v' W+ r k8 C
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。$ ]7 d; U* O1 u- u& Y! I" z4 A+ d
if the 2 sets are equal, then you know the heavy one is in the third6 n) G" C! q' c2 @* x+ R9 |. |
if one of the 2 is heavier, then the heavy one is in that set
8 c$ d0 x b8 ]% D$ }# s* uthen divide the 4 balls into 2.5.39.217.76+ c4 R: ^2 W! B" v& Q6 L. C3 C g
weigh them5.39.217.76" t" t$ j' Q- A, B* H3 i
and divide the heavier into 1公仔箱論壇. G2 Y+ e' [! X/ u
and weight them.* g% c: \1 D/ w( D- R5 Y
3 x weighing and get the ans.
; }' j* H, t7 @$ Z; otvb now,tvbnow,bttvbin less than 15 secs. |