divde the 12 balls into 3 sets of 4.
8 Z2 R! d$ x; Q J; w. y/ hweight any 2 sets.
0 i( B9 P- ~ j) Y' Zif the 2 sets are equal, then you know the heavy one is in the third公仔箱論壇0 \4 K8 Q5 \! d! f, Y
if one of the 2 is heavier, then the heavy one is in that settvb now,tvbnow,bttvb9 s8 p- k+ ]7 K- |
then divide the 4 balls into 2.os.tvboxnow.com. h* Y# L9 T4 ^
weigh themos.tvboxnow.com& M+ T+ U3 V% Q. Y! U
and divide the heavier into 1os.tvboxnow.com& ~7 o" g* n0 \7 i1 |
and weight them.
1 e# l. `2 f1 s3 G. }* r3 x weighing and get the ans.
; V3 T# a1 g$ N, Atvb now,tvbnow,bttvbin less than 15 secs. |