hello1997

分3組4隻波子秤
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' [8 j( d8 G8 H& L, s# \5 l! D, NGroup A: 1,2,3,4
2 @5 ~- ~9 }4 g: H" t2 m* Q+ VGroup B: 5,6,7,8
! k4 n8 \; r* f( uGroup C: 9,10,11,125 d7 z6 \0 H" P0 f4 C
Group D: 13# ~5 a$ l8 J' _9 J
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Round 12 H! S" d2 J6 h5 Q
Group A vs Group B8 B2 P1 |, f; K, k8 e- W9 g! U2 T
如A and B一樣, 即較輕一粒在Group C or D
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! e9 ]3 J4 P. F* A& |: F; q) ARound 2
8 V) S- n) h* R2 a再在Group C拆成:; b  b6 [* I! `( [2 `2 N
Group Ca: 9,10/ E: P' l: h. S
Group Cb: 11,12
: p6 U7 W. J# v: Y* f& M% F, Z5 P然後再秤, 如一樣, 即13為較輕一粒.+ U$ b3 [0 M8 b8 V

8 r3 B+ |- h8 P0 d如不同, 即較輕一組有一粒較輕波子在其中, . d) D( S+ k$ j" j% V3 n
要再秤, Round 3, 之後便知答案.
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e.g. #1 假設10為較輕的一粒( _- k5 O. s5 G" s
Round 1
4 J: W" r& F  }; D, U2 Y! ^1,2,3,4 vs 5,6,7,8 = equal$ D/ H* b: {  g

, P0 K1 e& s4 F& V+ d+ K9 V2 gRound 2: z& X9 {: A4 h7 K+ O
9,10 vs 11,12 = 9,10 < 11,12
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Round 33 K! Q. c1 z+ a; J% V
9 vs 10 = 9 > 10
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& n4 j2 b! a) ^# J! X) BThe answer is 10.
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e.g. #2 假設7為較輕的一粒
0 L* B7 i2 g) l2 R$ b0 WRound 1* i' D' `" K4 N7 D. R; N
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,88 |% d5 B! F! [; q/ h1 n; f

: d$ L/ D5 q1 ?4 q" f0 lRound 2
- `8 D! l5 k8 l  V1 p6 {5,6 vs 7,8 = 5,6 > 7,89 `, l" J. E  B1 f3 P5 D) |( c

* V6 |( x0 v% z/ iRound 3
* b& G$ l* m, }2 G7 vs 8 = 7 < 8
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The answer is 7.- H1 V7 U. A: o) ?$ O4 e# E4 E( ]

0 V# U1 V- C5 x$ y' `e.g. #3 假設13為較輕的一粒
# @1 Y  X) Y/ E" y# g5 g( `Round 1
( C3 m: o# M* r1,2,3,4 vs 5,6,7,8 = equal, ?9 `& ?3 g( P; g

4 ]# q/ ~! c; }) f% g: ZRound 2. S/ m) d5 p5 h
9,10 vs 11,12 = equal
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No Round 3
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The answer is 13.4 H( ?) `1 m, s, ~2 d/ d
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唔知我答得正唔正確呢?!
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[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]