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9 N# Q$ f6 N. B( `+ |. |' D

, u3 \- \0 i1 e" N' y0 p, d" q1 ]『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)。1 L6 C$ j4 M2 V2 F$ f6 }
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？』: E  K5 T/ U9 s4 U. P

$ H$ K  F! I! W, R5 U1 }1 ~注意: 5 Z) i/ c  T! A
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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8 K1 Y" H( f, p

, G2 z( r/ D2 @( x2. 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6 i5 ?! w3 i* H* x2 d" s

# M6 T0 U) G  {) G[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
: w; z" |- S0 E# X& b相信e條題目都有吾少人玩...

/ A2 o* K# t4 P6 |2 c' B我以前畫左個chart去答,1 p3 ^7 D  E% Z  o0 l: A' N
等我搵下仲在吾在
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當日用左37分鐘答１２粒波子，差７分鐘才合格。+ L' ]0 W- P4 F5 {/ p
13.........  h0 @9 l/ z) x$ P6 u
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[ 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,
6 l7 ^0 h2 |' @( \' R7 i0 f8 Y等我搵下...

5 x5 G+ e2 a# }

5 K2 w; q7 q6 R, B7 X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:
( a8 U5 I  _+ B3 K$ V唔識隱藏...已經諗到..

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" ?+ w2 l7 C2 A8 F" `$ dsor !!!....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9 V3 L) `' x5 h
3 U* h& q1 ]! |# U, E) Q* m
[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:7 z  o) b) Q1 r8 I: _; {
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.
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:1 s3 O) Z7 i/ {: I% {! M3 {7 S

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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: H% J0 T+ N9 r. N# P  ^Thanks

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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.' e/ ~. }7 n& M0 u: d
1-6 vs 7-12+ U" [# g$ v( N9 y' N5 w
if 1-6 = 7-12     13 is fake
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7 R3 M# k9 O8 d1 M. Eif not
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! i4 z- j) X0 k, sWeight the 2 time $ |. P& G3 }& C. s

2 H# I4 @( @5 E# }5 u3 tSuppose 1-6> 7-12. J' c; {& X. u  o2 R

3 g% I; H; S% p' s, W9 x1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3% D4 K1 z  A" s) u' N
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Just like the first Step3 ^2 o! \) D& E2 E

5 D3 C+ A2 `* t9 _8 E4 vs 5
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if 4=5 6 is the fake one
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4 L2 {% M' ?! u$ ?) yif 4>5  4 is the fake one
$ U5 n/ H# s; r' t% S2 v5 \4 A) j. w$ X
and so on......................

hello1997

分3組4隻波子秤$ @' z4 Y0 ~0 p* M
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Group A: 1,2,3,4
" H6 Z* {$ i5 D. i3 t& tGroup B: 5,6,7,8
. O* [, F# {: D$ z6 ^Group C: 9,10,11,12
0 `. ]- {/ k8 h( VGroup D: 13
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Round 1
* _/ S. M& f; K$ \! g' c1 ^0 H0 \Group A vs Group B
% g, A$ u7 c; t! C/ V+ v如A and B一樣, 即較輕一粒在Group C or D
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Round 2
: x9 K3 y7 P& S: b. h再在Group C拆成:
9 A0 L& |0 _. tGroup Ca: 9,108 W. I' S# I2 M( `! g6 _3 o" i0 B
Group Cb: 11,12
* T0 P  s( c& x- s: E然後再秤, 如一樣, 即13為較輕一粒.
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) B% H3 q' x" D0 {; |如不同, 即較輕一組有一粒較輕波子在其中, * i* Z1 J/ _% }, x% `, g
要再秤, Round 3, 之後便知答案.! D( i) L$ u2 C" D8 u
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e.g. #1 假設10為較輕的一粒
2 Q# o& P: e  u5 m' s$ y' YRound 1
+ \* d" J2 L* n2 l+ v/ D% f+ g2 i  f1,2,3,4 vs 5,6,7,8 = equal
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2 o, S) k2 k3 o6 x: b7 N& C' RRound 2
4 r/ Q+ g, m" c% b4 X2 W9,10 vs 11,12 = 9,10 < 11,129 Z/ _2 Y* R' {9 G& R
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Round 3$ A6 y9 Y# J/ K3 t
9 vs 10 = 9 > 106 w6 z# A# ?+ X0 R+ s  j( K: U

+ p% l: b" l, K5 O% o8 WThe answer is 10.( `+ Q- D- u, M- d6 ^
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e.g. #2 假設7為較輕的一粒+ u! X% w; `# U/ l
Round 1" V7 F8 S3 I' R4 F6 c% v
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,84 k; d- ]  P6 t* g  Z

: O) L0 q+ r5 jRound 2  M6 ~, F* ^$ L* @
5,6 vs 7,8 = 5,6 > 7,84 c' y/ |+ ^+ ~& t* j

, ]# a- G7 M+ B, w  uRound 3- V( k! U5 M, o
7 vs 8 = 7 < 88 G; y/ k6 B5 B& b3 y
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The answer is 7.
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& P( m. Y& d$ X% g. R! Q6 me.g. #3 假設13為較輕的一粒
* z; f/ G/ ]. Z, mRound 1
8 M; K3 k2 B- [1,2,3,4 vs 5,6,7,8 = equal0 n/ @9 e/ u9 x8 }0 o
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Round 2% a/ ~% v: k3 L) T& p
9,10 vs 11,12 = equal
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3 {2 D3 y/ B+ s% `( T& t. Q1 }No Round 3' Z. ?. @" F8 |2 p0 ]% a/ P
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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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[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:- H$ O- |. u* C9 L! J* O: \- A
1.
  I1 z3 j( p5 l0 Z; K; h2 A1-6 vs 7-12
0 x, Y5 F  Z/ ]2 H) oif 1-6 = 7-12     13 is fake: A$ H) D0 B1 n0 p* b

2 c! K9 R; J; s+ M+ n  z- r0 nif not
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Weight the 2 time
7 }; U- ^, Z  C5 k2 ?/ @: ?5 [) Y- Z4 I9 y" U
Suppose 1-6> 7-12! G' R5 C6 c" v8 @2 ^. N1 A

' X7 @* |& m: X" ~5 v1 c0 a1-3 vs 4-6
- _/ f: i- m. ?! i* G
) Q+ ?* P2 U: C8 }. AThen Weight the Third
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# z( o( H( I. M0 _/ N  PSuppose 4-6 > 1-3
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Just like the first Step1 `; l. P2 q+ f
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4 vs 5
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3 U# [7 O$ j: ?7 ], S5 Cif 4=5 6 is the fake one # z2 T" O4 l" {# ^2 Q

: d3 l7 x; P3 nif 4>5  4 is the fake one / D# t6 Y, U$ w& q
and so on......................

# E- I! u# E' c
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' j! i9 `4 E3 N# \6 z問題第二步
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Weight 1:  1-6> 7-12
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8 J% |+ l1 J. x# O2 SWeight 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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========================================
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. j: u% y- Y" b$ H9 b8 @. @  O9 D問題第三步
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Weight 1:  1-6> 7-12: ^* \5 c& s0 @4 {3 i: M$ A* L
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Weight 2:  4-6 > 1-3
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$ O: p! i9 j( B$ L+ U4 l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