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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! z. p! \- D* F3 L『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)。; n4 P% ^, S& ?, \. o- ?" }; H/ E
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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* h8 c9 c  r( x( R( f7 u4 u注意: ; y7 [8 A3 v3 Q  r' u( y

4 j, n; [7 A( f  u! h1. 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! W! T4 M; j' k0 p
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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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& }  a7 {: O0 q8 h) A9 e[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
1 ]# ]4 a2 S9 ?5 [: `3 |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,% E+ F& r% S, c/ b7 q# Y
等我搵下仲在吾在& h! t9 P$ r% w
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
9 w1 g7 s& ?# a! B" v- P6 J9 q13.........4 \3 f0 B0 L& a# g

1 J* ^) T" P: Z/ C[ 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,; g$ g; [+ S$ m& L3 }: T
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:
1 w0 ]* }  a  e0 I唔識隱藏...已經諗到..

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* f+ c2 G+ y, \3 n0 N+ O1 `6 _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5 Q% Q( }- p/ \) x6 K

) Q1 w; v; V" M7 H: I7 h" H[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
* F% f5 \+ ]5 E# l/ ?2 O/ C相信e條題目都有吾少人玩...

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) m% @( m' \: T! ~/ g5 APlayPlay, Let me know later who has the right answer and I will add points accordingly.: ~8 X9 K0 D( L& e, S

( r0 {/ v& o; R9 HThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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9 s6 a6 V% s5 w' u. u: `+ D3 n2 mPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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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.
. d; A9 r: U/ J6 {5 D* Q. A; \1-6 vs 7-12
& c* k5 B$ I# Iif 1-6 = 7-12     13 is fake3 d% o  o7 Z$ h& A. E. }: h
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Weight the 2 time
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  [. A1 `1 k+ f- M# QSuppose 1-6> 7-12
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7 @+ w6 b" A' N4 [1-3 vs 4-6
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Then Weight the Third- B5 h3 t3 ~0 s
3.
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- d1 C7 m# E, j. V, f7 }) ESuppose 4-6 > 1-3
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Just like the first Step8 ~1 T: C$ Q  h4 D) t+ q; Z  M

" s7 A% k' F& L5 n6 ?; K9 t3 I1 {4 vs 5
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if 4=5 6 is the fake one
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/ N& I3 A1 Q, @- g5 i/ M0 `6 lif 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤
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3 d& z+ d; z: Y" M7 }, ]Group A: 1,2,3,4
$ P" M. t  W' N% p+ j+ oGroup B: 5,6,7,8
% N3 ?4 k$ y1 H/ E9 r" MGroup C: 9,10,11,12; s7 ^* {2 F1 r% N& a5 f
Group D: 13
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$ n* b8 g5 P4 B) p, q* e* nRound 1% _( C# j) U8 W' c  P5 I
Group A vs Group B
; C6 x. Q8 e% q+ c8 R' h/ d如A and B一樣, 即較輕一粒在Group C or D
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- c& j7 w+ v4 G9 X& aRound 2- F% }  y+ R4 Z9 w" \& M7 ]
再在Group C拆成:7 O" a. r0 s$ z' B4 E0 H
Group Ca: 9,10, U7 f2 g  A: ]6 t# p9 k9 Z
Group Cb: 11,12
+ k, t# e5 N$ ?9 o0 b5 v然後再秤, 如一樣, 即13為較輕一粒.( V* w7 _0 @+ \3 S$ B

: {( h9 \2 N% p1 X如不同, 即較輕一組有一粒較輕波子在其中, / R1 u5 N8 a/ k' e2 i. Z4 i: ^
要再秤, Round 3, 之後便知答案.
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  J5 l, C5 }) \) _% @- [e.g. #1 假設10為較輕的一粒
. Z, Y; A5 P' e; P4 u: I. @Round 1
3 f/ S- W2 P) _0 \- ?, B( U( e1,2,3,4 vs 5,6,7,8 = equal
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Round 2
& U1 k# q& _8 K2 [9 K! U/ j9,10 vs 11,12 = 9,10 < 11,12
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% M; W; D) D$ g' x. aRound 3
: w9 x( `$ b1 g0 \9 vs 10 = 9 > 10
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The answer is 10.
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e.g. #2 假設7為較輕的一粒
4 S7 ]0 Z  s# ]4 ]$ URound 1
; y/ m+ e& |0 n1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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3 w) j# y3 N  @+ R& PRound 2
( u. `: h- O$ n6 ^) _" y5,6 vs 7,8 = 5,6 > 7,8
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/ e8 g) }* j, w. k* B3 d% ^( wRound 3' w# s# f4 z  X* K3 }
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
& d/ v9 _3 C& m$ CRound 1
8 @; V" _' @! z. m5 S1,2,3,4 vs 5,6,7,8 = equal
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! ^( r, _1 h* H8 cRound 2" z( M; G) g7 e& c6 a
9,10 vs 11,12 = equal
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No Round 3' Z; ^) z3 |6 \* i6 d4 ^
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The answer is 13.3 p- g: q! I  G9 e

2 G9 ~# b  e9 h: K+ E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:: ~' A  e% |* _" ?  c( h; t
1.
  J; z* g$ J. S: Q; a1 z3 e; i  u1-6 vs 7-12! g) W6 |) Q9 ~/ ^3 t6 M6 T
if 1-6 = 7-12     13 is fake
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if not 6 I. A; h/ p& t3 U/ n  Y) r, I' \: M& A
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Weight the 2 time
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) }; F$ c) G0 Y- e+ j! rSuppose 1-6> 7-12
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1-3 vs 4-6
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9 Y- I: W0 j# oThen Weight the Third
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Suppose 4-6 > 1-34 H. c# ^: s4 q: u. X8 \% _+ E4 t
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Just like the first Step: t, z* j. p2 w4 E. c! t* ~0 L- D1 l

* z" ?( w' @4 g% C; d, b4 vs 5 ; t  X, @7 z% m
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if 4=5 6 is the fake one + Z: f, y. j$ i& x6 ~; K3 ]

! U/ z) _- L+ R. l5 Sif 4>5  4 is the fake one 9 `* _" K2 G7 Y% N
and so on......................

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問題第二步
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Weight 1:  1-6> 7-12' u4 V, }8 i5 \0 X2 {* L( m
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6  U+ C- F& s4 Y. d

7 E& {: M+ i7 j8 P; i/ d& }% ^9 j你第三步点去搵 7-12 边一粒???
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% I; L7 k4 v: @" ~6 v4 b========================================) M. z! f7 y% f0 j1 Q, s8 s4 z

+ `1 `6 ^% n' U. P4 d) x1 s& E問題第三步
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Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3 9 z1 \8 E/ ?/ ?" N* n

4 s) a( b. `) o# e0 W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