hello1997

分3組4隻波子秤/ @# M" U: F# A* B2 J

' ?9 M1 I$ z3 m8 K- c7 z; Q6 gGroup A: 1,2,3,44 ?1 C7 w- N; M6 _7 o6 l
Group B: 5,6,7,87 l- G2 D' a2 l: _+ b* H
Group C: 9,10,11,12
) Q: K6 J( B3 j; wGroup D: 13+ ^6 Y/ `6 C5 q7 F/ M8 i* |1 D

2 f1 l6 s2 I' T' ?* X7 xRound 1
# j$ A0 x% X0 C4 i- z1 s8 o' ^  kGroup A vs Group B$ _: A/ @, Y6 g/ T/ `4 S
如A and B一樣, 即較輕一粒在Group C or D
% }9 i: G+ @" e9 ^
4 z: Y* F9 y5 ERound 25 N2 v4 Q  J3 l$ y
再在Group C拆成:
2 a! G$ u! q+ T( H  YGroup Ca: 9,10" m' E8 ^) G# e* h
Group Cb: 11,12
( ?% q0 x, G6 e0 Q; I$ y+ q( p然後再秤, 如一樣, 即13為較輕一粒.
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; m) K) [! @( f* w' F3 j  u0 I如不同, 即較輕一組有一粒較輕波子在其中, & J# h! n* _( E* r' Q9 X
要再秤, Round 3, 之後便知答案.
0 g, }% Y5 A. F& L- Q
  D* O: W$ ]1 \3 M. Xe.g. #1 假設10為較輕的一粒
4 W$ {. i7 E) w6 ^. Z+ A& n4 ]3 DRound 1! c& I8 b) ?0 ^- J2 b" t, j2 N
1,2,3,4 vs 5,6,7,8 = equal
4 V. ]1 ~# U/ `: x6 v2 K8 M0 d; ?6 ]/ }
Round 2
1 t$ S0 S) l+ o# E+ }, O9,10 vs 11,12 = 9,10 < 11,121 A3 m- k$ i+ r! S& H

% s0 l: L. s% O+ aRound 3
* p9 r) [& a# u) y4 R9 vs 10 = 9 > 10
" |1 W- u# }+ h4 ]% h5 K7 P9 R; }! V* T
The answer is 10.+ O8 |! d' `  e

, O! J0 L; x! l9 Q( W# Ue.g. #2 假設7為較輕的一粒
( c6 R* s7 w3 C  |- ?Round 1
2 L5 B0 }3 k8 T+ h1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8) N5 H- C$ D; W  u, D
  L1 a/ g* D6 f1 p' S# n* c
Round 27 N6 @5 g4 z& W6 f
5,6 vs 7,8 = 5,6 > 7,87 m2 e5 g7 @# u' h' i0 z

) Y& p) K4 |! w# L( f3 a- T; f, {( B  |5 \% |Round 3- D0 @2 g' f7 Y# k: q& v" D
7 vs 8 = 7 < 8
) {* s9 D8 A! q9 f# u
1 U$ C/ b- f5 ^! ]* L: SThe answer is 7.* i% B2 {% c) k( m( b9 f, m

7 k8 l' V" ?  p8 be.g. #3 假設13為較輕的一粒. i* ]7 [% k( `6 K  ~5 U* n
Round 1
$ L; C: a  H% E+ |% @  H& R0 c1,2,3,4 vs 5,6,7,8 = equal' W- R5 I3 _* a7 {' A& o0 Y

/ w; `& B: n3 n+ ~' L2 u" QRound 2
4 c) ^1 [4 O; m/ u( v8 X/ ]! |" j9,10 vs 11,12 = equal( X9 p, K5 Z! P; G
7 p6 Q" `3 H2 a- n3 c) P: [
No Round 35 L; \, R% `/ Z4 c
6 y3 g, J/ W* x% M+ }
The answer is 13.
7 d2 D2 v8 d& }, b  y9 _- o9 O2 }
2 n9 e% V# T% d' p% w唔知我答得正唔正確呢?! % [  p0 G) U9 x7 j

# ]; `: Q! U! j# r6 n* b0 u[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]