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0 v+ |: @( k2 M7 c( N6 B

' t+ t, X8 L. q2 i『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)。
6 \. }% t1 H( ^7 M9 q' L9 @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？』
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注意: 4 z1 a1 c0 @+ N3 v* {

1 {+ @- h7 M: ^. p1. 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. @4 t5 K6 ?1 B. ]# E+ ^$ g
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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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[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
4 {% O6 P6 r# y( o9 \9 N相信e條題目都有吾少人玩...

# L& g# N- _* y% \' A我以前畫左個chart去答,
, a2 G$ _  s* P# ^等我搵下仲在吾在0 p; {; P- f: a1 p

  b) E! W- w( H9 J6 H當日用左37分鐘答１２粒波子，差７分鐘才合格。
& q" \; y( E# J5 g$ a" K13.........% \0 y6 m+ U0 E: N$ X4 e4 W% a: r  Y  F

; [+ a. c! X/ J* t[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:
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我以前畫左個chart去答,' L% C4 q" u. S$ l7 p& }/ N
等我搵下...

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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:
$ ~' X1 t7 n" P& l9 Z, l& c* V唔識隱藏...已經諗到..

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sor !!!....e加改左! c% G4 I- K5 V0 t4 R( S
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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
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, k- G* a( n8 n& E/ L, O) q8 ~[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
, E0 c% D4 D# [# @9 L8 d2 V$ e相信e條題目都有吾少人玩...

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.0 ?7 M  s6 B3 r2 z( y+ {
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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& A5 A' ~5 n) Z( I: BPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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: c9 B8 T' g* g+ Z& rThanks

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) M% r: H3 }. S9 J8 M* n/ r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 7-12
8 j6 W2 m9 T7 U+ m  Z& U- ?if 1-6 = 7-12     13 is fake" ^1 l" D4 X6 ]
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if not
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9 B+ y# ^, O' [; g- |( P3 y3 [Weight the 2 time 6 a8 c  d$ ~, ]
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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 Third6 m4 p7 ]! Z4 a+ a9 D+ Q7 W
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Suppose 4-6 > 1-3
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Just like the first Step
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2 U6 e9 C3 x* K# U7 f4 vs 5 / J* v% k! e& R. ^- h( p, M4 H

' t  B/ u1 w( h4 ~$ o  y! Cif 4=5 6 is the fake one 2 W# z+ ~. x* [: R0 G/ W& r

  m" D, |$ [4 @if 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤" G1 a: D# N7 z. O$ Y, U
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Group A: 1,2,3,40 M- d" ?* M  C$ F
Group B: 5,6,7,8
( I, b: N+ [$ s$ IGroup C: 9,10,11,129 I% L  b9 n9 K% K8 Y1 u
Group D: 13( P( [$ H! v4 E/ F6 @% M
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Round 1# z6 [( ^* N; x) k
Group A vs Group B
+ Q1 [( M3 I" N. I: ^如A and B一樣, 即較輕一粒在Group C or D8 Z: C. e. r5 f1 \" p- l% O

* @6 |7 c$ N+ j6 ~Round 2
& M  R1 \9 K8 ?# X/ m5 _再在Group C拆成:$ x$ F& Z) Y6 h; [
Group Ca: 9,10
: x' w. c9 N* p" j4 b% y) SGroup Cb: 11,12
2 x4 R$ ~8 O9 E  Q3 o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,
/ j+ P) n" y4 T- S8 m8 f. V$ y, ~要再秤, Round 3, 之後便知答案.
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1 ~# Q( Y. W! u+ l1 I- }e.g. #1 假設10為較輕的一粒
( T: w: ~5 _9 |Round 1- z8 r7 X9 L, Z# e2 i( l4 N" s- x8 V
1,2,3,4 vs 5,6,7,8 = equal$ ~+ C/ ~8 \# g" T
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Round 2
7 X! u) V! Q' E- \4 I8 m9,10 vs 11,12 = 9,10 < 11,12
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" f  Q8 v, V) t. c8 r8 `% J# rRound 3
0 {7 }2 g$ Y3 W5 O9 vs 10 = 9 > 10
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The answer is 10.
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, Q2 y  K; `; N5 N! A1 J# e8 Ve.g. #2 假設7為較輕的一粒( x2 w$ Y5 T8 S" Y
Round 1$ _3 ^$ }2 R6 T" D
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8  J6 l$ t: B& [
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Round 28 ~* |3 \' U2 `* r( i/ ]: q
5,6 vs 7,8 = 5,6 > 7,88 n9 Z7 T8 Z2 ?  u* @

& M" ?8 _7 F& B/ l! _Round 3% U/ _6 q, H" {# m. b( s
7 vs 8 = 7 < 8
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The answer is 7.4 l5 R4 |! g) `& M' W! P

) h  Y' a( f' `8 be.g. #3 假設13為較輕的一粒% w, u& T' [1 h& m& Y  v2 B
Round 1
) q2 \3 V& z$ w( x2 h1,2,3,4 vs 5,6,7,8 = equal
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. u# m7 L& b4 k! `" m, Y: hRound 2
. B: C. Y) @2 y5 g% k9,10 vs 11,12 = equal
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No Round 3, |+ p" w, C" ~8 c8 [
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The answer is 13.
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唔知我答得正唔正確呢?!
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8 x9 ~, r  B2 V* p0 F8 D[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:
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1-6 vs 7-12
; o1 t& u( u3 ?* H5 Sif 1-6 = 7-12     13 is fake
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* k8 \2 [) A* ZWeight the 2 time + r% p1 h/ q. s; x* L9 G

. R6 a; f, [5 k0 ?Suppose 1-6> 7-121 }$ v, S, o8 }5 [1 T7 [' P6 ^

" {3 i2 C- u' I3 F7 Z$ i1-3 vs 4-6 2 d/ \2 z8 c0 n# o+ t0 j3 G# z

5 F  a. K: n( i- qThen Weight the Third
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8 c( g' S( @9 X2 p1 C, q% aSuppose 4-6 > 1-37 ^& }4 m- B9 b. [3 I
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Just like the first Step
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4 vs 5 1 s. s' p; ~1 n/ ?% [6 e$ [0 n7 b
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if 4=5 6 is the fake one 9 p4 I9 _5 k/ n% D0 t. y

8 N- B% L% ^: r. A1 g; mif 4>5  4 is the fake one
" y1 A! e1 M' F- r8 ^  xand so on......................

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  `* E$ _& w0 y問題第二步
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2 ]4 f: @, Z/ s$ jWeight 1:  1-6> 7-12
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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???; X: t* t1 m$ N  n6 i: @6 X
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========================================
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問題第三步# `0 w) ^: L+ S1 g3 a/ z  T" v

$ m- V3 b+ ?/ _: M# P& B5 XWeight 1:  1-6> 7-12/ s: Z0 t9 \5 ~6 g! V
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Weight 2:  4-6 > 1-3 7 \9 f# o  q& T3 R  v8 C/ ~0 t; d

2 s& O+ ?2 r; @5 r* T' y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