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, g+ c3 K) _  K2 H+ Q* S7 f. n$ p

* I0 Z9 ]( {# M) P『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 t9 X8 P+ |; K! O3 H1 `
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？』: s* ]! h* ^, H; G& X. `# T  x2 q5 K3 ?

6 {. |9 B1 F; H9 {4 |7 Y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
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- r: a* k9 C9 \5 n( [, `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4 W5 P( c' S5 b
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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:
1 E5 ?( @8 }/ g; ~4 M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,
8 x; B& `+ k. E8 g等我搵下仲在吾在
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. `6 H# E  D; d( x當日用左37分鐘答１２粒波子，差７分鐘才合格。
! z* Z+ X; h$ i# n. s! t# O13.........
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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:8 w5 x0 c$ P& o4 l. X

# w9 }. f0 Z: C1 \我以前畫左個chart去答,
5 p  x& b' Z8 {- W8 d/ b等我搵下...

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( a3 q+ p( ]8 d- q8 a! x' G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:
! l# Z: K% U3 b" \唔識隱藏...已經諗到..

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sor !!!....e加改左2 D5 G) H& h# K& O+ e1 C

. y7 }. g7 q! u5 w* }3 [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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[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:* \- z! o/ d( ~; a! K. `
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.9 _7 g% `: h! G
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:* f+ x+ P% ~3 U' ?& t9 Y

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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" [8 h. g, q# O4 r, H- UThanks

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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.
* h9 v: v/ ~1 W1-6 vs 7-12
# B) c+ s1 C+ d' N) t5 xif 1-6 = 7-12     13 is fake
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( U0 o& A; w. c3 rWeight the 2 time
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Suppose 1-6> 7-12# g( I3 T3 C: B" B) n  E( D# U
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1-3 vs 4-6 7 G8 ]! ~' h# B1 k# _6 X8 k" R

) t; v8 w1 G# D" Q1 QThen Weight the Third1 o8 W1 x# D+ G/ X" p2 A2 L- {6 X
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Suppose 4-6 > 1-3
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$ f3 R( z+ {$ AJust like the first Step
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4 vs 5 % ^0 T& S. o% T
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if 4=5 6 is the fake one 9 Q- M5 x+ b, b( w9 L

% F1 @8 O$ H  [4 J7 k& kif 4>5  4 is the fake one
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; ?4 Q5 }. O9 B" yand so on......................

hello1997

分3組4隻波子秤$ q' Q4 @6 [- n1 C1 {  \
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Group A: 1,2,3,4
: ~9 O7 I' W  \' ?Group B: 5,6,7,8
& T0 J% {4 @8 r* N. Q: [1 [; fGroup C: 9,10,11,12
3 Q. r$ x, d& q( v- |( MGroup D: 13% o3 _( x4 S( |6 S1 Z6 o7 n
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Round 1+ `' j( y* f, v4 n
Group A vs Group B
) r4 n: [" @1 {# a$ E' }; E如A and B一樣, 即較輕一粒在Group C or D
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, c" [1 G6 \$ B2 q# R5 pRound 2
# R; u# B7 a3 O) t' b# l再在Group C拆成:
" E$ d+ N! P! mGroup Ca: 9,10
- C2 c( `/ @1 n# I# Q1 IGroup Cb: 11,122 K. Y; v# u; }4 Z  R! [3 `% a
然後再秤, 如一樣, 即13為較輕一粒.
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3 O* _. t9 ^% ~/ t- I/ \  w如不同, 即較輕一組有一粒較輕波子在其中, 7 n& I% \+ x, W+ m
要再秤, Round 3, 之後便知答案.8 v- H* O4 d/ L. O: C  K' F

- u+ d" f2 C- w# y% i9 V1 w3 |e.g. #1 假設10為較輕的一粒, z/ U( J. {2 C! T4 c8 V+ m
Round 1- z' o) Q9 n: t1 Q
1,2,3,4 vs 5,6,7,8 = equal: Y( m' j" ~% a0 f: L
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Round 2
3 p6 ~. ?, O' q; {: z9,10 vs 11,12 = 9,10 < 11,12
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! |" u( f! S: Y4 ARound 3
& }8 b, I) p) O$ F( F9 V* ^9 vs 10 = 9 > 10
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The answer is 10.2 `5 F* g& A8 u$ x4 ^7 ?
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e.g. #2 假設7為較輕的一粒0 C' q( ~7 f/ k& ~
Round 1
+ o( u6 s2 q3 G) O1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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9 y! @0 f  V3 u0 U/ b0 @( w3 z# dRound 2# V: @  s6 D# u. i  n* {& _
5,6 vs 7,8 = 5,6 > 7,8
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Round 39 S: `6 j" ]: X) W2 k& B
7 vs 8 = 7 < 8
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- J* z: ?/ V, ^4 E5 fThe answer is 7.
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4 y: S9 j8 S2 K! o. j% fe.g. #3 假設13為較輕的一粒1 U# z2 ]: c+ x6 e
Round 1
1 H0 S: j; V2 [6 b1,2,3,4 vs 5,6,7,8 = equal
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Round 20 b1 ~2 {5 g# H
9,10 vs 11,12 = equal- k6 j8 Y0 }: n* w

  l3 V/ V1 q+ n% ENo Round 3! D# ]- L& A! k3 k5 k+ {$ i$ _/ `

# J% ^* P6 G: w( @0 `The answer is 13.
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2 l7 E0 F  u- d7 ^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:+ B3 k& ]: ^8 Y/ J7 q9 z% v
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1-6 vs 7-12
9 E2 X/ z7 [( \* O7 i+ gif 1-6 = 7-12     13 is fake7 I. a+ m6 z! p
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if not ) ^0 M2 d7 t: z) H5 w( y- W4 V; m' f

8 h! L& p/ N2 J: ^Weight the 2 time + E; T" e" H; [9 R

% c3 A$ V( ^2 E' ?/ F" i/ }Suppose 1-6> 7-12$ M1 _1 R1 ^+ U% _* T

  }9 [. z# V3 r6 s) A1-3 vs 4-6
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6 c8 H/ Q  Z# |, K& L2 DThen Weight the Third
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. [( \3 g" V, {Suppose 4-6 > 1-3
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5 K2 p9 I, Z( B- }Just like the first Step
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4 vs 5 , A& |* y  L0 H$ `" k% m$ S; C1 G
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if 4=5 6 is the fake one # @1 ^; Q+ |8 W: t  s) l
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if 4>5  4 is the fake one
: a0 S, B5 t* b  l, n3 Wand so on......................

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問題第二步
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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
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+ r& d/ l9 T, ?8 ]) a* P2 T5 D+ K你第三步点去搵 7-12 边一粒???2 ^7 `5 ~9 U+ o7 C% a

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/ {5 H' h6 C/ E, b: M問題第三步
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Weight 1:  1-6> 7-12
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' H  ]. D- E, q# n4 B+ wWeight 2:  4-6 > 1-3
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; U: k7 _. H+ w0 g- 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