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發表於 2007-3-2 12:35 AM
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分3組4隻波子秤
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9 u- a1 B/ h$ H9 c; wGroup A: 1,2,3,42 M$ Q0 m) v7 w Q4 }) B
Group B: 5,6,7,8
: V* ^* X% G$ b- `Group C: 9,10,11,12
2 Y# r/ l9 {! _3 U$ F. v" @Group D: 133 F% R. J: M: M7 M; S
6 R9 \3 i2 P v6 jRound 15 ^& F6 t( y+ H# F3 Z7 W. s
Group A vs Group B
/ N \1 V! B( S" ~" M1 N% u& t如A and B一樣, 即較輕一粒在Group C or D
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% x+ S- {7 t; d# }3 d& SRound 2
7 X7 Y4 `; K/ z3 D7 v再在Group C拆成:. S1 C; }5 S/ }0 X
Group Ca: 9,10( n5 _. [# ?, s0 m, f# B3 ]
Group Cb: 11,12
5 q. A Y& s6 c+ l$ F然後再秤, 如一樣, 即13為較輕一粒.
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% X0 g$ l9 B2 v, s如不同, 即較輕一組有一粒較輕波子在其中,
# ]% z$ Z% Z' X2 e; {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: _7 A% \7 r, F; K+ Z" h
Round 1 y0 i6 ?6 E" v( ^
1,2,3,4 vs 5,6,7,8 = equal
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( y1 ] m9 E8 [7 eRound 2
' t' h9 |! ^2 H4 p* Z9,10 vs 11,12 = 9,10 < 11,12
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8 a& e% g+ G6 l* w, KRound 3 ?! D+ u, R# D* a7 m
9 vs 10 = 9 > 10
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The answer is 10.! |& i: [ Z) y# c( u/ a0 A
* t# o! m8 D! G& [8 Te.g. #2 假設7為較輕的一粒" Q$ c! u' C8 Y( _% T4 S
Round 1
0 d: D# D0 [' d3 I& R( B1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8' d) j! }1 t2 {8 I6 v2 u0 _' }2 n
, h5 q' Q3 b5 W1 t# J" WRound 2, o( X9 x g6 G; c5 M/ u+ Z. x
5,6 vs 7,8 = 5,6 > 7,8
C' ?8 s( x* _
' k( N0 s) [: V. W6 CRound 3" n6 ?/ N3 r: l: f# R1 g
7 vs 8 = 7 < 8
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The answer is 7.
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; J/ N2 j" W4 S/ Q1 u" v" O- me.g. #3 假設13為較輕的一粒
/ l, g1 U5 o% k; v9 n2 S$ nRound 17 W1 I- i" P# R9 A" N
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
6 v: w0 O, G- V( V4 T) I; ~9,10 vs 11,12 = equal
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3 k, p- h. r$ \No Round 3, ?' |2 ?3 f% Y- l Z; K
, O ?' f- D3 L: [ F: i! fThe answer is 13.
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唔知我答得正唔正確呢?! 
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$ B2 E0 E2 H2 F& I[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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發表於 2007-3-1 11:57 PM
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