divde the 12 balls into 3 sets of 4.
/ D7 y% D* `. J( \; a+ k4 ?6 |TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。weight any 2 sets.5.39.217.76& O% K/ p; e7 ~- z
if the 2 sets are equal, then you know the heavy one is in the third7 b; r* E u; ], B' I( R, }2 R% W8 K# j3 [
if one of the 2 is heavier, then the heavy one is in that settvb now,tvbnow,bttvb+ T. v* i" }5 l
then divide the 4 balls into 2.$ L0 ?9 S9 L: G6 n+ M3 k6 o
weigh them
! y& y3 T* q, `( q& @( ~and divide the heavier into 1
( \$ F/ i6 P4 p2 ytvb now,tvbnow,bttvband weight them.
8 t4 ~7 O3 A0 U6 `3 x weighing and get the ans. 1 i/ m8 f/ l3 b3 m! [4 o8 }' {
in less than 15 secs. |