divde the 12 balls into 3 sets of 4.
9 n& ]/ n5 n/ ctvb now,tvbnow,bttvbweight any 2 sets.
! @ @- \" g! M5 Cif the 2 sets are equal, then you know the heavy one is in the third
7 c. j# f i- a, b/ ~2 Y/ j" _if one of the 2 is heavier, then the heavy one is in that setos.tvboxnow.com1 E- i- ~- S; R0 ^1 \6 V
then divide the 4 balls into 2.tvb now,tvbnow,bttvb z% p) F$ Z B/ W; b& t
weigh them
# ~4 t# h0 w8 _2 b% H' s3 htvb now,tvbnow,bttvband divide the heavier into 1公仔箱論壇6 E' t5 J# u- I: W6 p
and weight them.tvb now,tvbnow,bttvb- O: w& G, ?/ d. w5 s) G% ^
3 x weighing and get the ans. tvb now,tvbnow,bttvb# [3 b- k( `* U% z3 J' b+ W A
in less than 15 secs. |