divde the 12 balls into 3 sets of 4. " ~# q* i* S+ v2 g; W$ i8 A
weight any 2 sets.6 f' S( j- i1 K+ B. m$ w; A5 O( v
if the 2 sets are equal, then you know the heavy one is in the third
* {, ~6 S5 P# _3 Xtvb now,tvbnow,bttvbif one of the 2 is heavier, then the heavy one is in that set公仔箱論壇$ [) j' D" M, O/ q8 [
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。) }" O8 L q% T: @
weigh them
5 K+ b1 `6 h! H' C7 D0 c' ltvb now,tvbnow,bttvband divide the heavier into 13 D9 |6 d2 O6 h& \# X
and weight them.
( U% D. |# Q% k; N7 wtvb now,tvbnow,bttvb3 x weighing and get the ans.
6 h- h' \. B8 D/ t& g( c5 J! vTVBNOW 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。in less than 15 secs. |