推理大挑戰(第四關)

playbr2

相信e條題目都有吾少人玩過,所以今次一於改難些少.....由12粒波子变成13 粒波子......不過對於識玩既朋友,應該都屬大同小異既啫2 y4 J4 h2 O& N: ~: p% O

% a( Z& _/ O" Y- Z5 Z$ b- s! [『有 13 粒波子，有 12粒是重量相同的，有 1 粒是重量不同的 (沒有列明是輕了 / 重了)。) x3 [& \) v4 S  J  ]/ |/ _' Y
現准許使用 3 次天秤。請解釋怎樣才能找出 13 粒內那 1 粒重量不相等 (即是重了 / 輕了) 的波子呢？』  q, @# L$ p0 I8 ^* y  w. Z

3 g) t% b0 J0 ^2 ]注意:
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1. 回答題目時,波子的名稱代號請用使用 1,2,3,.......至13 等數目代表, 即1 代表1號波子 , 13 代表13號波子.....以方便查證! a9 l) ?8 [, l2 I. e
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2. 請回答題目的朋友使用'' 反白功能 '' (即係將D字既颜色改為白色,白色颜色在黑色颜色上一行,透明的呢)穩藏回答答案,費事比其他人抄  , hide 字要連埋 , 內容 = 答案
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3 o$ g+ D1 Y$ i4 r1 q[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:6 X9 }$ S9 a/ f5 W/ O; l
相信e條題目都有吾少人玩...

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我以前畫左個chart去答,
/ d4 g( F1 p9 z# r) o" J等我搵下仲在吾在
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% k( Q; [1 T+ y4 w& T, k5 \當日用左37分鐘答１２粒波子，差７分鐘才合格。
3 J# V0 j- _% f* O: ~& X# o13.........( h& h6 K: _% `: E& U

$ \4 s8 u* r8 i$ }0 R0 v- D[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:6 [% F2 V+ ?' O, x6 Z8 C7 l% [

3 V: f: [$ h  b; L% e  E我以前畫左個chart去答,
/ s+ ?8 t; }% |* P! S  M, w等我搵下...

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! X% H( K8 p$ Z記得穩藏答案

16749

唔識隱藏...已經諗到..

playbr2

Originally posted by 16749 at 2007-3-1 11:35 PM:  {9 x) s" C/ O
唔識隱藏...已經諗到..

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sor !!!....e加改左
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2. 請回答題目的朋友使用'' 反白功能 '' (即係將D字既颜色改為白色,白色颜色在黑色颜色上一行,透明的呢)穩藏回答答案,費事比其他人抄6 x1 `" q! {1 o( O
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[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
" Y8 V+ H+ p( q  y相信e條題目都有吾少人玩...

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6 T/ {% X3 I4 s* A# mPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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& `1 k9 p! N: E* f$ cThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:8 m8 q5 M8 d% h4 n# F
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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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# E9 v/ Q  m9 w) F1 o  t% L; p; eThanks

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" j: F" a! d4 Z0 i( J不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

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1-6 vs 7-121 m0 j  a+ q0 W% {. }$ y
if 1-6 = 7-12     13 is fake
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$ L8 W, c0 Z# r1 U& |; D/ qif not : f9 [7 {" [+ d0 e- {: W! n
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Weight the 2 time ' M* X! A0 M# m, [' z. B
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Suppose 1-6> 7-12
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1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step
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4 vs 5 . w: s4 A- `0 P( O1 F' c

+ u+ ?! p0 A- Nif 4=5 6 is the fake one
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if 4>5  4 is the fake one / W) X; k/ P9 s$ c; {) X
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and so on......................

hello1997

分3組4隻波子秤
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/ C  w5 |5 N5 X1 v" x" _9 _" Z! J" ]Group A: 1,2,3,4  ]- e' C/ O' E
Group B: 5,6,7,8
" y$ m( A/ q: `% j+ aGroup C: 9,10,11,12' A; Y; X! B, Q
Group D: 139 p& J& S7 n# s' E

: ~0 o# p# h# O* e; O0 `! pRound 1
6 Y' s; k, ~( r! wGroup A vs Group B
2 G) E4 h2 q% H4 k如A and B一樣, 即較輕一粒在Group C or D( C, {; F& Y* e* J3 O
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Round 22 M: h7 i% z+ p: J8 _
再在Group C拆成:
% q; x' W, x& z8 ZGroup Ca: 9,102 J* ^, W8 ]  n# N: I: ]
Group Cb: 11,12
: q5 [' d# M7 [7 b! n! ^" @3 A然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中,
. ?. b+ ?5 F; u! ]# O% ^2 ?: R. q要再秤, Round 3, 之後便知答案." l# C& K! j9 m

5 K' k. s$ {' `; ye.g. #1 假設10為較輕的一粒% f5 c, m+ {! y/ S* I
Round 1
" c4 {4 T, F/ U* _1,2,3,4 vs 5,6,7,8 = equal4 L/ o9 J" o4 h  O! l

1 w& j4 e; u* r/ z0 [Round 2
* L  P2 W8 q6 u3 S$ ^- h1 b- j- B# M9,10 vs 11,12 = 9,10 < 11,12" U* i- |8 S/ l; x) C

( L) K7 [6 K0 e: Z0 qRound 3
4 W8 s5 A0 s4 ]9 vs 10 = 9 > 10
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The answer is 10.  {8 S: e2 r0 ^  L
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e.g. #2 假設7為較輕的一粒7 \& ~7 X1 N! g' C; F& A
Round 1
8 ]% N3 G5 O% y( I, z, t1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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* U% [4 {5 }- G: HRound 21 y* I+ _, u: Z7 ]  p9 {' i) f
5,6 vs 7,8 = 5,6 > 7,87 z5 r0 k) h' T# }0 _+ g0 f# m  F

( y' Y" y8 l- e  w; gRound 3& w; Q% T+ W9 }
7 vs 8 = 7 < 8
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The answer is 7.
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e.g. #3 假設13為較輕的一粒
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8 @' N7 ]  c* C7 x( l  e6 M1,2,3,4 vs 5,6,7,8 = equal
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9,10 vs 11,12 = equal
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* S9 C' ?( `3 R8 V7 r5 tNo Round 3
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. N. V/ P3 p4 Y0 L8 K' T9 jThe answer is 13.& K# A, k3 ]4 E9 H. B9 \% ]7 L: O
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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 ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:. k' s  u4 h4 l) w& w
1.
# Q  U  Q; h. V. Q5 z2 h1-6 vs 7-12
; F8 i; }2 {7 H$ O( ?) ]if 1-6 = 7-12     13 is fake1 c5 w4 c% U* h( f4 [
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if not
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5 `5 F3 O1 ~* A% |- QWeight the 2 time
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8 o' A& X/ V7 ?/ Z# t# }; E5 s8 B* rSuppose 1-6> 7-12
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1-3 vs 4-6
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* C8 X! U, x$ w; V  l; n- U! r6 fThen Weight the Third
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Suppose 4-6 > 1-3
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) c4 e0 @' D! NJust like the first Step4 N2 Z( a4 D. h8 ]4 b. u7 `
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4 vs 5 : v, ]) A/ s2 G+ T
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if 4=5 6 is the fake one 1 U. u* Q* l+ s& s
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if 4>5  4 is the fake one
" f3 `/ u' B5 R6 l' sand so on......................

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! N+ d* r* n, o5 a; T7 D6 x問題第二步
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Weight 1:  1-6> 7-12* d) P5 a/ X8 M1 A0 z7 v
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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你第三步点去搵 7-12 边一粒???
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8 z8 f- n1 j( T3 K+ k/ x, e問題第三步
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$ \' w9 e% l. m4 ~7 ~7 sWeight 1:  1-6> 7-12$ j  X- W1 y2 a; e

' J2 {7 x( |3 a& q- E% FWeight 2:  4-6 > 1-3
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( h4 t2 v8 a: \你又吾知粒波子輕D定重D ..... 咁点解第三步只磅4-6 吾磅1-3 . 如果個波子係輕D ,咁4-6 就一定一樣咁重