divde the 12 balls into 3 sets of 4.
* q* F0 g2 L# X1 Mweight any 2 sets.
1 q, T4 L3 Z6 wif the 2 sets are equal, then you know the heavy one is in the third
) s6 F/ N+ O2 pif one of the 2 is heavier, then the heavy one is in that set6 w4 O, q" C( q. _) Q! v3 [& e
then divide the 4 balls into 2.tvb now,tvbnow,bttvb* v: ~4 w- _) V8 I0 U& y
weigh them公仔箱論壇: e% t3 `( R) n5 L5 n# W
and divide the heavier into 1tvb now,tvbnow,bttvb' V% R- a5 _/ F k b
and weight them.
6 ]* h6 a/ {1 R4 Itvb now,tvbnow,bttvb3 x weighing and get the ans.
' [! \8 e, r6 e# f( w/ y- }公仔箱論壇in less than 15 secs. |