divde the 12 balls into 3 sets of 4.
" Y, ^8 \2 a7 o4 ]# s# X" A5.39.217.76weight any 2 sets.1 t1 x& O* G/ s/ k& n
if the 2 sets are equal, then you know the heavy one is in the thirdtvb now,tvbnow,bttvb, l! D' x2 k1 C
if one of the 2 is heavier, then the heavy one is in that set
3 [+ y) z( {. I Q9 |" f5.39.217.76then divide the 4 balls into 2.tvb now,tvbnow,bttvb) r5 M9 ~ F" v1 v5 ]* F
weigh them
+ t8 }) S4 @8 Y b( c8 S5 Btvb now,tvbnow,bttvband divide the heavier into 1' v( ~) A- J4 `4 `# {
and weight them.公仔箱論壇5 y8 C5 L- O" w4 B1 h
3 x weighing and get the ans. 5.39.217.765 A1 k, U/ z+ M1 @) u" _
in less than 15 secs. |