hello1997

分3組4隻波子秤
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1 e3 i: K- ?4 y2 T. s# z- ~Group A: 1,2,3,4( p+ |# |0 R# Z$ F- e" V: Q
Group B: 5,6,7,87 e( B) m& ^- W# O5 G8 k4 |9 \$ ~
Group C: 9,10,11,12, {2 |- A3 O4 J  r
Group D: 139 i( ~/ y( ?+ a4 g

: r( Z! S5 R/ M9 F: xRound 1
. @, X4 g+ I2 ?3 R' PGroup A vs Group B
! m5 I) O7 I& H9 ^2 X6 T/ w" j: f如A and B一樣, 即較輕一粒在Group C or D
7 o* }* {" l; i5 o6 ?; E0 p+ y7 w; G! g; v, g0 Q
Round 2; c7 N( \' G5 m7 j3 w7 ?
再在Group C拆成:
9 I/ y' {' Q; N1 s* t' S4 QGroup Ca: 9,10
( F. H: [' v  W' ]Group Cb: 11,12
- b0 ~4 H4 w0 T6 G然後再秤, 如一樣, 即13為較輕一粒.
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3 _! A* r+ n9 B% e8 b0 D# B如不同, 即較輕一組有一粒較輕波子在其中, - l7 V! v' S7 Y1 m* K2 e
要再秤, Round 3, 之後便知答案.4 I, V  ^  w: a! o
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e.g. #1 假設10為較輕的一粒! ]8 M7 q2 ?4 @& o! L& w
Round 1# m) L% `( |2 h: F, u
1,2,3,4 vs 5,6,7,8 = equal5 x- r$ r/ ^$ ?' H1 B/ k1 U6 t
: u& w; V4 j8 t) J9 J1 \/ R/ u
Round 2( D  _, u& x! I. L. ]  ]. `0 D
9,10 vs 11,12 = 9,10 < 11,126 P* U8 V; W* p0 {; w, b

+ B8 \6 n. F, {( P" CRound 3
7 [- y6 q) A) j. `7 V# s9 vs 10 = 9 > 104 A1 ]5 p/ K4 Q) H

9 a2 p% m* i) o' T1 cThe answer is 10.2 A+ F/ H$ a- T& Z! Z& c+ x  i" x( M
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e.g. #2 假設7為較輕的一粒1 b  [2 |4 p* I+ Y
Round 1, }, D% V& ?, ?& \* C, s
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
4 s4 L( J1 j) L( w% w
8 y8 r$ y0 h, B& N8 J& ORound 2
3 R% Y- |- x' r' H3 |. e7 x5,6 vs 7,8 = 5,6 > 7,8
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7 l4 r! a5 @; wRound 3& g( o: m2 s3 C* E/ }1 _& I
7 vs 8 = 7 < 8/ N# G5 y% h% ]1 y. S# f8 ]
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The answer is 7.* h6 ~! J) m) U' ^0 {! `  A
* x# {- l/ n5 x+ Y, E( B
e.g. #3 假設13為較輕的一粒$ R" j7 x9 s3 d! t; P- E- h, n0 L
Round 1
: ^: p( _; f& B5 C8 H2 P3 T1,2,3,4 vs 5,6,7,8 = equal5 K+ ~& W. D$ j; D. R# d

2 ?6 [& ^2 D3 \1 ~" \& a8 h& c/ j; cRound 2: g5 s& h2 E9 E6 i/ Y5 m3 o
9,10 vs 11,12 = equal
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& n% b. P3 c. Y2 c2 }( iNo Round 3
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) o7 @6 n' Y' J9 N, ~6 q- LThe answer is 13.
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唔知我答得正唔正確呢?! 3 \& a) m' L- s" ^/ b/ ^# u
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[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]