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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# X2 X% ~* A/ _# P, 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)。3 P& s& \3 ?( _) x9 }) b
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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- [; L2 R9 ^) _. c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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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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[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:1 |) x0 W& U! Q; ~4 ~9 i% q$ V
相信e條題目都有吾少人玩...

* G7 h9 w" {  H/ \+ h( F我以前畫左個chart去答,
# U' f7 R, E$ P$ \0 i等我搵下仲在吾在( q7 @2 w8 E. p" e% o# P& d/ I

% d+ B/ S: d& T. V& y) o) c: c當日用左37分鐘答１２粒波子，差７分鐘才合格。
  ~0 P- g6 A! K1 b. F( N# i4 W; Z13.........
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, e! @* _8 Y# `; e' p& ?[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:( E! G' F; V- a2 r7 C4 y

& G" p' p7 R' Q& ~" U" L# d  o. |我以前畫左個chart去答,
" J$ M8 o9 @* T0 p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) T: P( H: N' f! z唔識隱藏...已經諗到..

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sor !!!....e加改左
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- M& R0 R! D- G; x/ `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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  `$ n3 J: g; O/ @/ M4 T- x[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
; ~0 S, Q2 R3 f3 T; ^相信e條題目都有吾少人玩...

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: j% u# O& D5 yPlayPlay, 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:% w# r+ `% ^. ]# A2 ?+ ]* g3 p& z/ x9 q

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6 |; o3 a- l7 B) M4 Z) o9 t6 D3 ~8 xPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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/ I% c; j" [$ Y7 L4 r. S3 sThanks

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9 n9 [3 ^: r# M; `5 T不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
$ x; J5 k5 I3 w) k3 z+ ^1-6 vs 7-12" e3 \+ R1 L$ c
if 1-6 = 7-12     13 is fake
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Weight the 2 time
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  p2 C6 R' m3 O! W; ^( pSuppose 1-6> 7-120 x  E5 U9 N$ d3 Y4 y9 S2 k( p$ ]1 {
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1-3 vs 4-6 - `0 K3 ?! C+ c
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Then Weight the Third
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Suppose 4-6 > 1-3
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6 P" r# s9 ]7 v& w4 Z5 s  b) B8 WJust like the first Step
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4 vs 5
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if 4=5 6 is the fake one $ z+ z5 P! c. l3 H4 {0 H

4 B, m( B- U/ m. A! d: E. iif 4>5  4 is the fake one ! p9 t* H* G& s& ^4 q. n, C- ?0 Q

7 `) k" v  P0 pand so on......................

hello1997

分3組4隻波子秤
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/ G7 P6 V* S* X6 E' LGroup A: 1,2,3,4
  x! G  N9 \1 d2 \Group B: 5,6,7,8: u* _4 {% n  C- e) S
Group C: 9,10,11,12
9 b* N* C* H2 B% F: m% r7 ?  aGroup D: 13
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  m$ Z$ [& P7 s) CRound 1
, l2 ?3 g7 v' {# IGroup A vs Group B) s1 I1 P+ D" P# q, ?+ b; c
如A and B一樣, 即較輕一粒在Group C or D' q. Q0 ~3 U) |
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Round 2
8 O8 v( b  ?2 o再在Group C拆成:
, h+ G. b- l+ \  JGroup Ca: 9,10: G2 {6 m# u1 Z8 H  i
Group Cb: 11,124 c7 B$ v: r1 O6 q) q( u- h
然後再秤, 如一樣, 即13為較輕一粒.
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9 o& o7 k5 p7 @5 ?4 Y- Z$ _" B如不同, 即較輕一組有一粒較輕波子在其中, * [! g9 ~2 X" Q1 r
要再秤, Round 3, 之後便知答案.
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e.g. #1 假設10為較輕的一粒
$ y2 w5 V0 s8 bRound 1" ~! Q' Q! {; L& E# @1 o
1,2,3,4 vs 5,6,7,8 = equal" c3 ^1 F  E' D+ U* Y+ d

/ w. d8 a4 N; r' a& O1 y/ I/ gRound 2+ F# S" V' S: w$ N7 B4 O8 J9 Q
9,10 vs 11,12 = 9,10 < 11,12
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- N  p7 ~5 G5 O! l. b. ?Round 35 I; b) D! p! ]5 K$ z
9 vs 10 = 9 > 10* B1 r- E. r2 M" E. K$ l
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The answer is 10.! I" A/ w' W$ C  |8 f

  y7 E+ O4 x- l6 he.g. #2 假設7為較輕的一粒: Q* a1 t/ f' Q; Y
Round 1
  e* q% t) B9 J% `$ ]4 q1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,88 }# ^, S5 z( b8 d
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Round 21 u( q) M0 w- n; h- z
5,6 vs 7,8 = 5,6 > 7,8
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Round 31 R3 {1 v: e$ D
7 vs 8 = 7 < 8% }' g* ?& j0 c; c* m

/ D) Z9 ?; x4 C1 L( Z% bThe answer is 7.
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& k' z7 X; U) O1 a/ q# se.g. #3 假設13為較輕的一粒
" P2 G! Z9 @7 F. wRound 1
2 W4 N4 z7 B* A; y+ E' K1,2,3,4 vs 5,6,7,8 = equal
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Round 22 K6 h6 P4 D; H% {) @7 j/ J& s
9,10 vs 11,12 = equal
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No Round 3& F/ g/ b2 g' C3 D. ]
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The answer is 13.
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唔知我答得正唔正確呢?! 2 b$ Q; i" _5 {5 g* z9 {0 N

5 ]% p6 ]5 s6 m" B. T6 w- u[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:* l$ c7 t8 {# B' n2 H" i8 f
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1-6 vs 7-12
3 L3 s, ^2 b! b1 a3 x1 Y% p( [if 1-6 = 7-12     13 is fake
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5 L0 v( P# P& Gif not ! t  ~5 [' d. x6 G3 L! _$ R/ U

% [! P  O" p+ ]2 B; ZWeight the 2 time " O  R: Q6 }1 S

  y# }3 s/ |6 w7 V: tSuppose 1-6> 7-12
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6 p0 H/ ]0 c$ {9 l  Y1-3 vs 4-6
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) Q$ C+ j8 U* ^% `+ V+ p, zThen Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step' P! V" ]' B6 F  C

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if 4=5 6 is the fake one
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if 4>5  4 is the fake one 1 i5 ?0 t" _4 m) `5 i
and so on......................

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問題第二步
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& y9 J# K, f- [4 w  tWeight 1:  1-6> 7-12
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, z: e4 c7 q& q3 w2 yWeight 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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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
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; \% j/ b; s. o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