hello1997

分3組4隻波子秤
9 P$ l( k/ X. E; \, B8 z
: O0 [- F: P  _  l  p7 a; uGroup A: 1,2,3,4
9 U/ o% G1 y% I: q! oGroup B: 5,6,7,83 P: [* p' ^8 b2 e) I
Group C: 9,10,11,129 z/ }9 ~' }" y3 h- \% l, y
Group D: 13. k# S  L4 _4 \7 t. f
+ Z( z& n) V# J, \! w% E: a. k
Round 1) W) J# r4 Q# {
Group A vs Group B5 E& F8 Q% q& x# p- H/ E3 X3 F
如A and B一樣, 即較輕一粒在Group C or D
( @* w. ~; {; R. i$ I/ }7 {# O: ^
. b; i5 m+ Q( \5 ARound 2" A* F6 y$ b: C  ?2 Q
再在Group C拆成:% e5 l- O: U+ Q: A. \
Group Ca: 9,10" @, o  p1 P5 w  g# h- g
Group Cb: 11,12
7 z3 C5 u" f* l# h然後再秤, 如一樣, 即13為較輕一粒.3 V6 [. P8 f; t! ?& _; X: j

; `7 W5 o# _" l* L如不同, 即較輕一組有一粒較輕波子在其中,
' @5 k9 Y5 |4 u) r要再秤, Round 3, 之後便知答案.
) Q5 r- E) e, ~7 E5 V5 s/ o/ I$ }/ y( u7 V: A# g% W
e.g. #1 假設10為較輕的一粒
- O* @5 ]* L% T9 w  RRound 1
! f. u7 t  e# E+ {1,2,3,4 vs 5,6,7,8 = equal
& w. z" Q* z5 w: Z, K2 t9 ^* p- W5 l- y
% T4 T8 E; A. B, v$ W" [Round 2
" x  o! b" @4 ~0 n0 q9,10 vs 11,12 = 9,10 < 11,12% P' g! E& q/ R6 w/ K& a7 B$ ^. w

/ `# }6 g# K! d3 ]2 IRound 3
- k1 k# ?, R( O! {9 vs 10 = 9 > 10+ p  z* M% a6 }* ]/ i

" X8 |) g/ p9 r, I! tThe answer is 10.2 m0 o: B/ c9 k: o" g$ ~
. \* j3 c8 k8 f9 m, M$ m
e.g. #2 假設7為較輕的一粒% V7 N+ Y' J8 q% P0 |
Round 1; \0 X6 X1 ?! {; W
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
" [. c2 J3 t3 e9 _/ V% B# ~( L1 L( _- L& B3 w" `
Round 2
2 P3 {) X" T6 @# _7 S! X8 U5,6 vs 7,8 = 5,6 > 7,8. \3 u) t* p+ k% D0 H
; j: G0 D0 Q3 j4 _" ?
Round 3
# Y% q# S; N9 d/ G& n" G" T7 vs 8 = 7 < 81 W5 \' s3 u+ ~& G: c8 S# I

( q! [, u+ b& w' fThe answer is 7.
6 u6 ^2 v5 g! K9 Z$ E  |( P: C+ y( ^' {: O/ T, i/ s
e.g. #3 假設13為較輕的一粒
3 E0 h9 U, S/ ?Round 1& R+ q% R, w% x6 f; T$ u3 h! j! E& Z! X
1,2,3,4 vs 5,6,7,8 = equal
6 i2 g; k, s, M8 K! r0 b- u
7 l; G* Q# P  Z7 W5 VRound 20 p: A4 o$ V8 ]3 t2 U! Z* N& b
9,10 vs 11,12 = equal; L! J) b3 X8 w( p$ L1 j6 m

& `- g0 V. e6 u0 L3 x' ?No Round 3
  i9 z+ ^; I8 s* k; y
2 ^% \& I& W7 t. o6 g1 hThe answer is 13.
) ^- y) f5 `0 i5 r/ [3 y, J9 y, y' c
唔知我答得正唔正確呢?!
& a( L! E% q( D, B: \- G- X! d: `: w# J8 Q6 ~0 Z- ?' @) ^
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]