divde the 12 balls into 3 sets of 4. tvb now,tvbnow,bttvb% U$ I7 n+ e( O1 n! n7 E2 l/ u
weight any 2 sets.tvb now,tvbnow,bttvb- D9 z# r- q& X4 f: B% m
if the 2 sets are equal, then you know the heavy one is in the thirdTVBNOW 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。2 V R0 T3 D' m, w/ Z( I+ ~
if one of the 2 is heavier, then the heavy one is in that set
8 e) S$ [2 _1 B: y! F/ O公仔箱論壇then divide the 4 balls into 2.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。( ]" u3 w' D/ E e& g v# a! O
weigh them
$ u/ a7 `& I4 d! L& a. W- Utvb now,tvbnow,bttvband divide the heavier into 1
: @ C( Z' n6 o. i; f$ D4 u5 R' Q- zTVBNOW 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。and weight them.
( h; c4 p/ w J/ u4 C9 ]3 x weighing and get the ans.
" ^* I5 r+ A4 U6 ]: f; oin less than 15 secs. |