There is 12 balls.. divide them into piles of 4os.tvboxnow.com- }. s E" u' h, Q" Z( C
so 3 groups for 4..name is A,B,C" G: U* J) i/ n9 z$ \
case 1:
& {" K3 V! L: f; j( t公仔箱論壇measure A -- B os.tvboxnow.com0 ?9 z+ Q9 a- A/ e& N' R z8 U" d
A or B is heavier
' A% {- Y: {& [" g+ ^$ Q公仔箱論壇divide that group into 2 by 2
! u0 H h8 ]( D/ ztvb now,tvbnow,bttvbthen divide heavier group into 1 by 1
+ ^6 l' J3 R5 S3 t/ s8 t$ H
9 l% s, n7 p/ Y3 G, n, ]tvb now,tvbnow,bttvbcase 2:
4 Q$ A+ w" M4 ]9 U" r. T/ \$ t {A and B is the same.. therefore C has the heavier ball$ F& Z$ t+ z. g: @! v
divide C into 2 by 2
* {8 p- p e+ s. p6 g" D7 \公仔箱論壇then divide heavier group into 1 by 1..tvb now,tvbnow,bttvb* N" \) a8 q% l# N+ j$ @
8 R) _9 o* D2 M8 T3 z9 o. z5 ]# U( Etvb now,tvbnow,bttvbgot it in 30 seconds.. not so hard -.-' |
發表於 2006-12-8 01:06 PM
| 