divde the 12 balls into 3 sets of 4. 8 K i8 W2 X/ @; y# Z. l/ M8 J m
weight any 2 sets.
( b J+ G, ^: ^- s. p公仔箱論壇if the 2 sets are equal, then you know the heavy one is in the third
. A# p. f8 {( ^% y2 h2 Gtvb now,tvbnow,bttvbif one of the 2 is heavier, then the heavy one is in that set
0 r5 v8 _7 z- {" i5 v0 A& q5.39.217.76then divide the 4 balls into 2.
/ I& u2 ~3 W4 R' L r. B! {$ H" S4 F2 n6 Nweigh them
6 z1 s1 b" D, a' \2 y9 k9 T& V( gtvb now,tvbnow,bttvband divide the heavier into 1
3 ]5 {0 l+ a, [. rand weight them.8 V- m/ z# ]5 W: C4 F) b
3 x weighing and get the ans. 公仔箱論壇) i/ U0 M4 f8 T% V7 b
in less than 15 secs. |