There is 12 balls.. divide them into piles of 4
4 e* I: J& O Z4 h8 H1 H" L p9 [so 3 groups for 4..name is A,B,C
" V+ e0 p' H$ {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。case 1:
$ F& R7 E$ A( A. V# `. I' g6 Ameasure A -- B ; C' a m- n9 r6 f$ x
A or B is heavier
5 [& E. I' Q! L! U0 rtvb now,tvbnow,bttvbdivide that group into 2 by 2tvb now,tvbnow,bttvb+ @$ I2 b* q8 s9 d
then divide heavier group into 1 by 1
: a& B6 @& y/ P4 e7 G3 ~5 D) _; X2 S: h6 f. W/ _
case 2:tvb now,tvbnow,bttvb+ z! t, t* ?* g
A and B is the same.. therefore C has the heavier ball
. `* E1 u7 Q! d/ b P& pdivide C into 2 by 2; E8 t9 x' c! K8 x4 o, C) z& O
then divide heavier group into 1 by 1..
}: i9 }# h+ m$ X! ~4 ptvb now,tvbnow,bttvb. l1 {9 }5 r: y
got it in 30 seconds.. not so hard -.-' |