hello1997

分3組4隻波子秤: ?" a) v5 N2 E9 J% p% O, a; ~

4 N5 q1 C( n9 Z* N3 L8 P: s' j; z: nGroup A: 1,2,3,4# ]& @7 Z7 R: j5 b  x
Group B: 5,6,7,84 w* e$ R- _' L3 u9 T5 L) f& D
Group C: 9,10,11,126 c$ S6 t. J6 h% N/ e; [8 }4 c
Group D: 13; H! |; n. Y5 U$ m* R) q

- a9 D( N9 N) h- `Round 12 v, m: P2 k+ [. X3 R# u
Group A vs Group B
; o8 G1 }# r4 p1 E& o! f% S如A and B一樣, 即較輕一粒在Group C or D) Q( O* Z0 p  C5 q

4 _! Y# q9 ]' [& ^Round 2
* h, b, R! o; Z再在Group C拆成:
2 c3 X4 x9 N3 e. V7 LGroup Ca: 9,10/ O9 q' p% t  t6 s: \
Group Cb: 11,12' d$ d/ v& I' p" L: h) A. a
然後再秤, 如一樣, 即13為較輕一粒.
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5 p1 ?/ z& I; J# ^: L( @1 h如不同, 即較輕一組有一粒較輕波子在其中,
: B5 S, _0 t- N6 Q' K$ b0 a要再秤, Round 3, 之後便知答案.' r9 k' L% G+ q: q. \

5 t# q* p" {, Ne.g. #1 假設10為較輕的一粒
$ H# G; B% C; U' u1 }5 ~0 IRound 1
0 Q( b; x* A' M; U# m$ t( k/ C1,2,3,4 vs 5,6,7,8 = equal& x* @8 A5 [4 i2 l) R+ z
5 ^7 h$ {0 }" l! b7 t
Round 2- v) Q1 H7 _& ^3 z: L* f% O: _
9,10 vs 11,12 = 9,10 < 11,12
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Round 30 N+ e9 g5 L5 I% k- M, ?+ {# C
9 vs 10 = 9 > 10
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% N& {* T7 m" G% vThe answer is 10.3 z. G( e% {! f: i
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e.g. #2 假設7為較輕的一粒
9 W9 q2 c# p1 H- S, z# RRound 13 I6 n8 }% f% s4 V
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8  U3 ?2 D) G$ q! W+ @

; W$ E4 I5 {% F0 f: G) f: ]Round 2( ]$ x8 h' |: ~* s- g
5,6 vs 7,8 = 5,6 > 7,8
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Round 38 d! P, D) R" k2 t
7 vs 8 = 7 < 8+ |' y- l, A  z; F
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The answer is 7.
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e.g. #3 假設13為較輕的一粒
7 n% u* `6 y- p. O: @Round 1
& t( E2 A- O% g# R  q+ n0 }+ f) q6 s1,2,3,4 vs 5,6,7,8 = equal( J# S$ S/ ~- X  `

( G$ Q9 k+ t, {4 X# q6 K1 Q8 g! nRound 2
' b4 R; n, V$ K2 ~5 }: C4 r9,10 vs 11,12 = equal: g) e) V) u( F( H
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No Round 3
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The answer is 13.) m' w8 w0 p, l" w+ ?5 r" l

2 c/ N( d* d* d/ W2 Y唔知我答得正唔正確呢?!
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( n3 e+ D4 k0 o8 E2 y[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]