There is 12 balls.. divide them into piles of 4
/ Y0 b+ e! j7 q, oTVBNOW 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。so 3 groups for 4..name is A,B,C公仔箱論壇2 M" n9 Y0 v1 s, @
case 1:
& F& K0 }& E3 U0 b/ @; A, t$ mmeasure A -- B
, x& t" b* \1 X& x0 `A or B is heavier
4 v/ g/ y K1 T$ W) Y1 btvb now,tvbnow,bttvbdivide that group into 2 by 2
" ?- R& A2 {5 s: U n. b |then divide heavier group into 1 by 10 @1 ~5 ]8 ^6 z f+ V5 C
公仔箱論壇' P/ X* ~$ u, V4 [
case 2:
( G J4 E: H2 l% c, xtvb now,tvbnow,bttvbA and B is the same.. therefore C has the heavier ball
, {" M- k9 @$ P* H5 |' q- Pdivide C into 2 by 2
! f. Z' Q& _- A' `" q% W1 {tvb now,tvbnow,bttvbthen divide heavier group into 1 by 1..
! y6 Q5 ^7 ?0 N B$ s5.39.217.77:8898
; Q X9 ]6 Y' r& Ytvb now,tvbnow,bttvbgot it in 30 seconds.. not so hard -.-' |