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
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+ f) \2 u: x3 K. h* U6 W9 J6 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)。  _+ R1 x1 i4 |! t" s* ?
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: % E+ Z+ f& ?" k" W  q

" ]2 y$ O. V6 A" @( G1. 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( e) x# j/ D( c" z
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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 ]  k4 B+ h5 g3 H' ?7 T[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:4 Q- W8 z9 q* q- W4 T$ b5 G
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,5 A; p/ b9 d0 Y) k% c( t8 U
等我搵下仲在吾在9 v6 i4 g% q' f* [1 {5 I8 l
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當日用左37分鐘答１２粒波子，差７分鐘才合格。, m$ P: m4 F' U$ I1 I* g
13.........5 C" k5 t4 O% E: N

' x- }2 g* E% V+ q[ 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,
* w* u( g! E- K" D3 {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:: w* G2 z3 ]% o4 K' K- \8 |
唔識隱藏...已經諗到..

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sor !!!....e加改左
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5 s: J$ f. o, S6 _2 Y& o2. 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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% D' ~9 S; ?& W8 D9 ][ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:: l" o% X: C3 X
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.5 {8 x! ~, w, E: o1 l/ Z' v
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:- t& v; D* C9 ?4 d- l8 U$ r

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# t$ r4 o( u" b4 Q6 zPlayPlay, Let me know later who has the right answer and I will add points accordingly.. J% F+ R9 I: w% c4 Z

+ `8 ?! _" @& w9 M) E1 vThanks

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不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
5 o8 q/ |: Y3 O% Z7 _2 Q. w1-6 vs 7-12: A3 Z. ^) V' Y7 j9 u
if 1-6 = 7-12     13 is fake
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if not 3 z8 {% |( P+ f9 v7 r

) \3 B# J$ @! }7 zWeight the 2 time / M1 O% w. L, @0 K
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Suppose 1-6> 7-12
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1-3 vs 4-6 " \& n8 s% @- h, }9 L0 i# h
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Then Weight the Third
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4 L& R0 ?* V) q# I# y, pSuppose 4-6 > 1-3- `4 d, m0 D- \8 p' f0 e

/ [/ f0 N+ K- e2 G/ A* l% UJust like the first Step
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if 4=5 6 is the fake one : p% K, K) A. k. x6 z

  E1 R" d9 K7 h7 v: V  s7 o' Tif 4>5  4 is the fake one 5 u( a4 C3 I4 l3 C3 k0 B8 E% q% @

3 J! ^" Q# o* s% aand so on......................

hello1997

分3組4隻波子秤
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8 ~2 ~# ~+ T' h" `- ?3 zGroup A: 1,2,3,40 m! G4 G* z4 e& i1 X' N
Group B: 5,6,7,8( M  S% H( P* _% `( H& J! i7 {
Group C: 9,10,11,12
4 l8 a2 r, d1 T# U# i6 bGroup D: 13- v! t; K! q' x4 G
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Round 1! P; Z5 Y9 c. z) j# q
Group A vs Group B$ U/ Y, U- Q% N& j
如A and B一樣, 即較輕一粒在Group C or D4 x, u9 B5 W/ t0 ~6 [

: a, n7 d( H: ~" j) V2 c4 J4 ~/ b/ pRound 2
9 O! u  `0 Z, `# S5 k& Z" t* ?再在Group C拆成:' s( i4 m# A0 Z7 @1 U$ q
Group Ca: 9,10
; I% T( o) t6 X0 V( PGroup Cb: 11,12/ j1 t7 A7 ?5 u
然後再秤, 如一樣, 即13為較輕一粒.  X: o" j5 T3 G; H

4 |$ B" v3 T: u' ^9 F/ j! i如不同, 即較輕一組有一粒較輕波子在其中,
# C- Y) t( c) n4 O/ C; L# q$ G- s要再秤, Round 3, 之後便知答案.) Y, |) K* O1 S0 t
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e.g. #1 假設10為較輕的一粒
$ ]- J& _0 u& ]Round 1
$ v. `- M1 {- |8 s. r9 u5 C1,2,3,4 vs 5,6,7,8 = equal' _4 d# X9 q# |% V5 t  ?( C5 @

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9,10 vs 11,12 = 9,10 < 11,12
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Round 3
6 A) v* V+ H$ c; {0 D6 z0 a9 vs 10 = 9 > 10
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The answer is 10.
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' s+ N/ X' Y2 M' pe.g. #2 假設7為較輕的一粒; F% ~, o; x1 |' G6 p$ r
Round 1
1 r: P+ ?; j" `9 V" {: `3 R1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8/ v/ |3 p2 h( k* z; |. v

5 i9 K1 _# c& ~: L, j  X# tRound 23 u3 R# {7 D# o
5,6 vs 7,8 = 5,6 > 7,8
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Round 36 S5 F  v5 c8 b/ e# M
7 vs 8 = 7 < 8
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The answer is 7.
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& Y1 n' C& r- h8 c% p. U4 ee.g. #3 假設13為較輕的一粒
1 n4 u% F% M3 G( x# QRound 1
8 ?: f  X$ n/ Y1,2,3,4 vs 5,6,7,8 = equal8 H* C! c+ f$ z3 Q; P  F$ W
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Round 2
( r7 x8 C* \5 |5 `- h; f9,10 vs 11,12 = equal
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No Round 3
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The answer is 13.% `  i( X2 @* U
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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:
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1-6 vs 7-12. @  i  g$ a& X- Y
if 1-6 = 7-12     13 is fake
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if not ) m' x+ U- t2 B0 T) {5 O, ]* h
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Weight the 2 time , c8 j9 t' M/ {- Q3 K7 ^" t

7 F% R+ n. P4 }Suppose 1-6> 7-12
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1-3 vs 4-6
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8 u- w6 O, B& m' A" N3 b# }3 f& XThen Weight the Third
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Suppose 4-6 > 1-31 f; H7 ^' A7 C: @/ r$ L

9 M1 `4 c) a& e2 J1 zJust like the first Step
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4 vs 5 4 H8 {0 |0 k9 ^9 x( E+ |2 z
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if 4=5 6 is the fake one + P3 B9 @! V6 x
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if 4>5  4 is the fake one / M2 I4 e) [6 g- a/ _* t$ V
and so on......................

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問題第二步2 p# Z; V/ ]3 I- U# N
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Weight 1:  1-6> 7-12
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6$ A0 {" g/ e0 T7 _; B2 \6 A
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你第三步点去搵 7-12 边一粒???
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- F* ?1 C! @4 @7 r: _========================================
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: `: m7 l" j4 n% n. a/ W; D問題第三步; B% ]2 n. D; O+ Z' f( m

$ C6 T3 K( ^( C$ ?% B* N6 PWeight 1:  1-6> 7-122 `$ [1 W8 K, j# s1 w: ?5 \7 |
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Weight 2:  4-6 > 1-3
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, G- K$ X1 j0 r$ n' I, {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