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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4 H5 m7 j) Y- a% h3 D7 e『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 q0 j& g3 b+ X8 l# N( u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？』( X, ^8 O! x, l7 f1 M" Y- Q: n
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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  M# Y9 o! `; ~; h
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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& o8 o# V0 w. T& m  [2 b

( ~. l' ^) T- A* T[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
* X4 C( {+ ^' ]" u- }相信e條題目都有吾少人玩...

0 `, \2 y+ |% l9 _0 f我以前畫左個chart去答,
& l, `* N4 z% m# s4 h! H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。
5 h/ @& J1 i  j; C/ @) ~13........./ V+ _1 B% r- p  e) w
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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:" L$ G% |7 L. I1 n8 s
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我以前畫左個chart去答,
9 r1 ~2 b! C9 x, N等我搵下...

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0 x8 C/ S- i# r: W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:
: g1 j6 f" {$ e; S  L( }; q唔識隱藏...已經諗到..

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5 F& E! {$ o% I; k) t7 Jsor !!!....e加改左. y8 Z5 n: v+ {3 A
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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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9 }9 u, {$ L# @/ D[ 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 f9 h; ]' W- l( c( 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./ V0 [3 c* `, J5 W
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:) ?. w! F$ [3 k& e( }. ~
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- u" ^, R3 e7 X' V  m) I! fPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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' m, m* @* r0 P. z4 o" [+ N+ O( MThanks

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$ _  g2 x# o9 t( H3 r/ D不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
1 \' H& [5 m/ s: C8 e, u" p/ ~1-6 vs 7-12' W4 T0 x, q' ]1 ^! {" n8 L) U
if 1-6 = 7-12     13 is fake; M) Q% F9 V( w) b6 v8 j
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Weight the 2 time
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- p+ ?8 x5 j6 k' q' H6 ?$ {& sSuppose 1-6> 7-12
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! t# z* J" b; y9 p' F. {1-3 vs 4-6 ! q9 @' ?8 [" ?# J+ O+ f
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Then Weight the Third: w9 s* q8 d9 N. z8 {
3.
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2 p  y4 P+ C7 g6 f3 h& h( k. XSuppose 4-6 > 1-3  R- F* B0 E3 ~8 B* @8 m5 y% L6 a

: p. S2 A" O# K5 z0 AJust like the first Step" ?  l' `+ v, a  Q. N& `
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4 vs 5
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+ l% D1 s! G! E3 {+ ~; g; Lif 4=5 6 is the fake one
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! W7 f  u( r$ V0 ]) E0 o; n' o  Nif 4>5  4 is the fake one / t$ N. k8 `9 S3 p( c) ~% l
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and so on......................

hello1997

分3組4隻波子秤% k4 A9 j! M+ x# e+ }) e

6 @* S7 O/ ~/ q9 g: CGroup A: 1,2,3,46 i# [( S+ i! o! g/ [9 k2 i
Group B: 5,6,7,8" _" d# N9 s: r3 C
Group C: 9,10,11,12% C' E4 X' F5 R3 F4 ~  j
Group D: 13
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: B. ~" ?6 ~8 S! g# `Round 1
; p/ m; Y" c& m# Y. k4 }, wGroup A vs Group B
& w, A* O5 r) t% }" t7 W" K7 K+ G如A and B一樣, 即較輕一粒在Group C or D
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" W4 S5 g8 Y- X8 c9 u1 ~( CRound 24 }' ?0 A* S8 G: a! b$ L' Y
再在Group C拆成:* u5 E) e1 ^/ A
Group Ca: 9,10
3 s5 f; A) \% t8 m. S" RGroup Cb: 11,12
# U% N8 `5 C) I然後再秤, 如一樣, 即13為較輕一粒.
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, S) e1 O5 B  W2 X如不同, 即較輕一組有一粒較輕波子在其中, 2 J% C' A! N. h
要再秤, Round 3, 之後便知答案.
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  D" |8 Y3 X; Me.g. #1 假設10為較輕的一粒
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  L0 s; w) U9 p1,2,3,4 vs 5,6,7,8 = equal& {  Y; ?! [+ y
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Round 2% \+ K- o7 r% i- ^1 s
9,10 vs 11,12 = 9,10 < 11,12
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2 m( N3 }4 n! g2 A+ aRound 3
  ~5 p6 U( Q- \2 Y8 B* @6 ]9 vs 10 = 9 > 10' L. t" X" A! e

, U7 D8 R$ v3 X+ c9 v3 w2 gThe answer is 10., |0 T; `  m* F; D
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e.g. #2 假設7為較輕的一粒
5 {$ v. p, N( m8 k$ PRound 12 }5 B+ K3 o& m: R
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
  }! W8 A; v4 o% ~5,6 vs 7,8 = 5,6 > 7,8
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4 S' q& i8 Q' Z/ xRound 33 g) m) p, K, c0 [5 u1 [4 [. t
7 vs 8 = 7 < 8" F! C% `- p/ }/ B

9 j9 ?7 t& N% s! o# H+ vThe answer is 7.# s) Y2 {& `9 g# k# s
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e.g. #3 假設13為較輕的一粒
6 Q. ]; d7 M# Z: D$ M2 XRound 1) s5 \) y2 ~& k% F
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
, ?" u* U( O( b! o& J4 ?+ b9,10 vs 11,12 = equal
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No Round 3# D( Y* y$ S, E: S2 t( t- h

/ }) X/ U8 m0 \3 p$ pThe answer is 13.8 O: {! c8 h2 ]$ N/ z  A

' ]$ Y$ G* {/ H唔知我答得正唔正確呢?! - ^5 _! U! z3 y8 l$ X7 S, {. \$ o$ A
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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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& m; B5 i/ i: K/ H: ~( ?1-6 vs 7-12
( X7 ?% ]" G# N7 b& gif 1-6 = 7-12     13 is fake1 `5 W. Y- X. q$ M; I- L

7 h( k7 A% X6 a+ j6 aif not
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Weight the 2 time + U/ q- L8 W8 N: ~( s" S6 m
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Suppose 1-6> 7-12
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1-3 vs 4-6
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0 [5 F# v6 _' M, {2 {0 x% }5 MThen Weight the Third
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+ Y  N; A* A; T) Y: nSuppose 4-6 > 1-39 U; [$ t' {- O+ r( G
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Just like the first Step! Z8 G8 b  ~* |/ _0 D
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4 vs 5
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if 4=5 6 is the fake one * D2 y% K3 m+ i8 S! |

+ I3 Q: [6 f& Y9 G% M6 yif 4>5  4 is the fake one 2 v0 y# F1 b% `2 z8 h) X: A( y
and 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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+ o- |5 W# `' c7 oWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6' h8 O3 r% Y( r1 p  d5 f. w$ A
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你第三步点去搵 7-12 边一粒???3 R; x  \0 b+ l% f6 B' A9 K! @
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========================================
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% _6 b# l0 P8 P4 D/ K8 h4 L問題第三步3 W. ^4 p5 `! a" l2 A8 [% K/ N

5 c/ b- g0 H" f) gWeight 1:  1-6> 7-12' R  T; V! a; w* w+ |' e

( Y8 O! H1 O, a* Q! Q2 [Weight 2:  4-6 > 1-3 ! H  b$ Q6 g' C; K
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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