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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% X& v( u7 M/ _. `: ?6 }; f; Q5 w: l
* q7 G9 I4 D% x+ ^, U6 O& v1 dGroup A: 1,2,3,4
- r1 O( d! _% n4 a6 H. `: |Group B: 5,6,7,80 ~6 r+ W5 x- w v3 ^( @
Group C: 9,10,11,12; T, X+ q% d6 k2 Y6 g0 B) y
Group D: 133 c, ~8 r) E* I i7 z6 {
* N" u8 l- T' D$ R6 Z
Round 1
2 E. I! q3 a, m b8 {Group A vs Group B
# h- M% u$ T( s* E: X# g如A and B一樣, 即較輕一粒在Group C or D
. [5 J: A. W2 b9 y" @2 ?: g% G# Z9 I& w [: H' h. Y0 ]
Round 2
# u/ m$ N7 b& T: Y0 z2 f3 c再在Group C拆成:# \6 o6 [9 t3 |
Group Ca: 9,10% Z! l$ y' `. e& k+ {
Group Cb: 11,12
+ h( K$ t* k$ I. |然後再秤, 如一樣, 即13為較輕一粒. z5 P' g y6 \% F3 d9 G: c
+ t3 v1 m [% D# }5 s! `; O如不同, 即較輕一組有一粒較輕波子在其中,
2 P! q \5 x& g: b; Y; u/ [要再秤, Round 3, 之後便知答案.
0 s Z. x, F% R4 K$ L1 [0 d0 ]/ h) u: M6 e! F7 n5 @# Y+ u
e.g. #1 假設10為較輕的一粒
9 r" j4 }# T8 HRound 1
b6 l6 S* U' y: M% K! L: {1,2,3,4 vs 5,6,7,8 = equal
( l# s7 G- F& i6 A; G
0 c/ L" [ ?5 pRound 2' U8 o& \% E# t/ N: E U$ `" ?7 q. X
9,10 vs 11,12 = 9,10 < 11,12
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Round 3
) R M9 O+ O' F Y9 vs 10 = 9 > 10
$ t; B( {# e6 d, @* \
3 F% P# M. q( ?( E2 CThe answer is 10.
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e.g. #2 假設7為較輕的一粒7 p; Z' Y5 ~2 q. @" v2 X0 E
Round 1& w- C7 o6 h3 a( I0 \
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8+ Y( |8 c$ {0 k" l
6 R# Z" b2 t# ?7 e- b! m- [- ~$ ERound 28 k' a# G, s% {) L
5,6 vs 7,8 = 5,6 > 7,8' {; @" A5 s7 c' ?' s
6 P( e' m z o/ D& a$ RRound 3% A: k0 f6 }7 S* S: r1 u) x( }
7 vs 8 = 7 < 8
, O0 y- {0 D5 c; g1 s3 ~# Y: M* Z4 y5 Q
The answer is 7.
! h/ N$ j+ F0 \) B: q! s
8 V8 I- I4 c7 K- Y. W) Ze.g. #3 假設13為較輕的一粒
; y8 V$ ]5 i/ f/ ]& G1 D6 }Round 15 |: C5 K# i5 {3 E8 Q/ Y* o m8 G
1,2,3,4 vs 5,6,7,8 = equal
7 u& k9 u) `/ o' @4 H' C g/ c @+ o E. p% v% B9 V v9 w
Round 2
: e: ?5 b/ J9 l X* ]9,10 vs 11,12 = equal
* U* _ j- ~( q% O% y) _! j c/ t' W
. q: |) M; J4 P) f! w) a; x9 g4 bNo Round 3: Q; P6 P8 m* Z* u, p( m. T
! S. d3 F9 P! {' i% e! z. dThe answer is 13.* @6 m2 I* P% {% h
) ^, _+ |! n7 W; R) E3 z6 R
唔知我答得正唔正確呢?!  . L; i$ y: U6 J
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[ 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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