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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『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)。: o/ q1 |+ s9 \+ P4 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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- B# C9 U; U( w( R5 y, [/ x注意: 6 W& t* P1 M1 m7 z) a

8 a/ O9 o+ x# L8 A) Y1. 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4 c* a: a7 S/ |! ]2 `

7 v( n4 l; A) r- s[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:& s* g; R* O1 Y  U4 N# F6 C* V5 ]
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,+ J  m; i* J  h9 ]
等我搵下仲在吾在; h' o+ ^' ]" ?6 Z- }+ |

+ N+ L; J" b5 B; B5 K, W5 {0 p8 Q' @當日用左37分鐘答１２粒波子，差７分鐘才合格。
  h' u6 f6 L0 s5 H5 s$ ]1 g13.........
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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:) E% G, \4 T% G3 y$ E

' {# N; `- i  `9 D6 D& t1 P我以前畫左個chart去答,, ?1 B) v$ d1 G# j6 h
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:
8 A: D& g. D! N' W# ^! ?8 |) @唔識隱藏...已經諗到..

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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( f+ d. o5 E0 D& H. u2 S

3 x9 s% ?9 o' b# j5 B/ ][ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:' i' [8 N% |5 p8 v
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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# k% l; Y7 t- S5 |Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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' o* b+ Y8 Z1 v% B; X" i% |PlayPlay, Let me know later who has the right answer and I will add points accordingly.& f. e9 J9 B( m- G9 m$ X
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Thanks

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; U3 i# `/ L* _$ ?5 i不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
4 a% C; K' {' M& s1 l" {7 B* K1-6 vs 7-12
' p9 `( O: c, V; i' e: b4 a5 Pif 1-6 = 7-12     13 is fake
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( ^: @" b  g" U3 C1 y7 QWeight the 2 time
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Suppose 1-6> 7-12/ Q$ b* t3 Q: I* Y$ ~+ p

- d4 y$ `" N3 y1-3 vs 4-6
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% F, Z; e# |* ?2 z# y, }Then Weight the Third/ \$ f3 \4 J4 i( ^. y! f
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3 n7 Y% }& J6 S8 ]5 K* p; xSuppose 4-6 > 1-33 _! B  k+ N: ?# ^- R
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Just like the first Step, C; o! Z2 E6 p* ?# |- ~

4 j* J3 j8 b1 U7 x4 vs 5
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  R. ^( i* {# wif 4=5 6 is the fake one * H  t* p7 l( J' Q% ~& \% x- g
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if 4>5  4 is the fake one
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9 ^7 y% M. A/ \and so on......................

hello1997

分3組4隻波子秤
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7 o& ?+ k: U# n1 D5 r, o  HGroup A: 1,2,3,4* y: Y/ I6 \9 M! I. e+ v
Group B: 5,6,7,8
, T! e& {# c0 y- j4 \& s8 c' tGroup C: 9,10,11,12
9 P' Z- u: g4 _; z- }. sGroup D: 13
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& E2 C. s' b+ a( i: jRound 1- `1 x0 j6 a, S7 U  ?
Group A vs Group B: n& U! m+ n' K. t3 S1 T; |- w
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
: z. S$ m& H$ e) v/ F7 L+ w再在Group C拆成:
3 [9 u! \4 w8 D, t8 _& mGroup Ca: 9,10# |6 H7 ]" t5 v/ G0 a
Group Cb: 11,12$ i  D$ a. u, b9 h- F* w
然後再秤, 如一樣, 即13為較輕一粒.
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5 ^& |0 j6 H, E/ n8 D- y* _* r7 n如不同, 即較輕一組有一粒較輕波子在其中, / L# {+ {) y; ~1 M2 q: i6 I) n
要再秤, Round 3, 之後便知答案.0 o5 ?! G5 W% M0 L& x2 J+ n4 }0 y, ?! s

& {5 D  S1 m5 L. n2 f2 J7 Z# je.g. #1 假設10為較輕的一粒0 Z2 u4 G% y2 A# s: _
Round 1$ G$ K7 ^) `5 a7 A, s" V1 q' C8 r" `
1,2,3,4 vs 5,6,7,8 = equal
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4 b3 L$ {9 A/ c& J* LRound 2
: }. b2 B: v+ Y- Z7 P2 W9,10 vs 11,12 = 9,10 < 11,128 Y" G5 Z/ Y0 p7 e  K- {, X/ X8 o
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Round 33 v2 N% [% d, G( M" s
9 vs 10 = 9 > 105 d4 s8 Y  U  \$ H
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The answer is 10.
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; m* G% e  g+ ^6 O) te.g. #2 假設7為較輕的一粒
' {8 @4 `  e% JRound 1
- a) K  F$ ?3 H$ f3 G4 M1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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7 u+ w/ p/ b& tRound 2
8 V6 e& w$ d2 ?4 P& c: `5,6 vs 7,8 = 5,6 > 7,84 y9 c" D% y( X+ n% a" V

( d  c. o0 Y7 U4 f# a  _; SRound 3, s: ^. L# B2 f; w: f6 m0 Q' U
7 vs 8 = 7 < 85 n' k$ v5 v8 \5 ^+ Q% o

& ^" |. ]0 e* }. sThe answer is 7.& I' d6 j4 T4 _. g& y

$ Y, ^; t2 B( l$ m  }9 ee.g. #3 假設13為較輕的一粒+ S# M% Y$ h1 Q
Round 1
) d% N& \, _4 U# G$ ~1 d4 D5 e2 t1,2,3,4 vs 5,6,7,8 = equal
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Round 22 D3 D% p* D) u, n; Z
9,10 vs 11,12 = equal
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No Round 3  n# m; j- ]1 n2 l1 T) J& e

* K+ M( b1 {3 g( E) s" z" ~The answer is 13.
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; }7 Z5 b# J9 B2 m6 ^- G唔知我答得正唔正確呢?!   @, v  j/ t( k  Z6 i' E4 H5 `
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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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2 }. W' I7 h6 ~+ p1 c5 t1-6 vs 7-12. s& H4 j# F! y
if 1-6 = 7-12     13 is fake% _. R) H2 v' U* h3 X

2 U# @/ Z  \5 {7 t! iif not 9 p2 `- b3 Z' D& T/ l" z) M

- J9 ?" ~+ _6 g9 CWeight the 2 time : r3 z4 k" Z4 v0 F( ]: e+ l
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Suppose 1-6> 7-12
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1-3 vs 4-6 ' v$ d+ Y/ q0 y3 q
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Then Weight the Third
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4 e  a) N. d8 c% t/ [Suppose 4-6 > 1-3" d4 }3 Q) B* p/ z0 Z7 q8 a
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Just like the first Step  N. Q. S1 I$ C  s: N

# {' x! J4 C4 k8 J4 vs 5 1 K5 m& w% }3 a0 b* _" t' W" Q

/ L  K1 f4 W- p, O  sif 4=5 6 is the fake one
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; s5 \% `6 c0 O, G; [; g& L* Xif 4>5  4 is the fake one
$ R7 t8 ]9 z- G" z' W8 rand so on......................

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$ Q5 T" g6 \" j% I問題第二步! m, O0 R' J: a$ y( ^
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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+ i: q: b1 P& c6 J5 i- @. f! S
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你第三步点去搵 7-12 边一粒???) `+ [/ F, w0 k( E# M& o) g
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========================================
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問題第三步
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Weight 1:  1-6> 7-12/ ^: e9 f7 h) x! {

9 a' O) K, o2 O2 n# l+ PWeight 2:  4-6 > 1-3
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4 X$ ?9 u! X- U2 b% e. n( w- q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