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)。$ J9 S& H6 W" c! X
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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4 ~' j% n$ K; M/ v1 Q% ^$ s/ [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* u/ h- C2 `. t% t) z

' ~% c; R' A! L% q* N2. 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  ~/ N8 n* Q/ n# F8 J4 y
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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 21:34:6 `/ B' I9 F0 ^( k  w9 k: M
相信e條題目都有吾少人玩...

5 B. X0 X/ b4 \  Z# W4 K1 x6 J我以前畫左個chart去答,; A' Y0 }3 X- E' P1 Z3 t
等我搵下仲在吾在! Q  P* D5 d$ x, A" K1 n9 j, f

1 w7 b6 p, u, s2 `/ B當日用左37分鐘答１２粒波子，差７分鐘才合格。8 S: G: e( N2 A# {4 |( O" y; w
13.........
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# d, y" G) A' C% O0 o" {* G* I[ 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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" P/ m6 x1 N% [8 w; E# p我以前畫左個chart去答,- Z0 d& r, C* B
等我搵下...

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; n& V5 v+ x1 @7 z& z# `# }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:
4 J% O& `1 @5 j# v唔識隱藏...已經諗到..

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sor !!!....e加改左8 o+ i: U) z9 X' B4 S* ?

9 t6 d" @; x" Y/ @: e% [' K2. 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:
7 z# V5 G. X+ h7 X, J. z, H) Y$ I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 `# b* _3 o. W* _3 @# l" r; ]
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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% }2 `) f; u( B. ?% V1 {. }* RThanks

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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.
3 N- }0 U' w; M8 }: w7 I" f( ^$ G- ~1-6 vs 7-12& C' i1 V+ D$ e: a9 N" q  i
if 1-6 = 7-12     13 is fake/ W7 z* B5 c  l: I6 h
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if not 8 {5 \  O0 [& }5 h8 b0 s7 R1 r& T
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Weight the 2 time ( y. ~6 q) H7 Z0 P
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Suppose 1-6> 7-122 d% g$ ^# E9 i

4 P6 I1 ?) [9 r1-3 vs 4-6
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Then Weight the Third
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' B: W' U; M8 e3 b; x- d8 u3 VSuppose 4-6 > 1-3
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Just like the first Step
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4 vs 5 * b) X. C, q: ^: ?
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if 4=5 6 is the fake one ) B3 P( z- n2 J: X+ v* z) J/ h
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if 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤5 a2 m1 r0 ?8 n4 B1 H) a0 [: i

  J0 l6 ]  x. uGroup A: 1,2,3,4- [. K! ?' d, k
Group B: 5,6,7,8' a# r  t' [- Y4 L1 k
Group C: 9,10,11,129 h. }, j4 e5 s9 `
Group D: 13
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Round 1
0 a* J' F9 i( Z5 Z, x( s9 Q- dGroup A vs Group B
( g9 x7 z+ S; F, r( p: x. F如A and B一樣, 即較輕一粒在Group C or D
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Round 2
* x5 M! k7 y' T" p/ Y6 p8 R再在Group C拆成:
! O! ^1 s0 {; R, jGroup Ca: 9,10; G5 S* s0 H" v* ^3 c
Group Cb: 11,12
! G5 _, K1 D2 L$ o4 h7 p然後再秤, 如一樣, 即13為較輕一粒., H( W* M) N) W# P

% V- o) q" \( }+ Z$ S  v如不同, 即較輕一組有一粒較輕波子在其中, , E- ^9 z- j8 @2 E3 V$ {' F' c
要再秤, Round 3, 之後便知答案.
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9 u1 u: N7 R/ |* _5 D) I3 Ye.g. #1 假設10為較輕的一粒1 M( r. h2 e9 \; u6 \2 X. l
Round 1
( m9 p# B! r. L# L- ~+ ]1,2,3,4 vs 5,6,7,8 = equal; I5 a' K, E8 `, q, a

8 y- r7 E( |& Q( }7 G7 NRound 2- J% D( y* @! I: C: @: P
9,10 vs 11,12 = 9,10 < 11,12& s' B! v' D/ L% r2 i9 K: P) Z

& i+ c1 ^9 m9 J5 kRound 3
; y6 `; x5 a1 b$ S% C8 h5 I' X9 vs 10 = 9 > 10
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The answer is 10.+ {; r, C) T+ D9 a0 k& L
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e.g. #2 假設7為較輕的一粒! r3 h% v) \: h7 o9 x9 _! e
Round 1& p/ b: `% D  W; e3 H
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2# b, c% w3 ]9 L& a1 d9 x
5,6 vs 7,8 = 5,6 > 7,8) H4 Y7 B( ~2 b- }6 O! g: W

( p0 ?$ Q1 u1 s+ G; YRound 39 Q0 t; W& D1 U  H$ D# ~& [  x( a7 s
7 vs 8 = 7 < 87 V& T2 s, k+ V) G$ @* w, m+ n4 Q2 u

4 z  `9 I/ V3 T! XThe answer is 7.9 w) e% W8 _) U( n
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e.g. #3 假設13為較輕的一粒- m) B3 K, A3 h, z
Round 1$ F1 u* p$ n& X$ \0 s
1,2,3,4 vs 5,6,7,8 = equal" A5 T. w0 T3 _8 O/ _! q

' G. O' a  a" h6 _6 _& sRound 2: z. D) ^: d7 i! W5 B5 J/ S2 r
9,10 vs 11,12 = equal
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No Round 3
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The answer is 13.
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唔知我答得正唔正確呢?! 8 f( m* r9 z1 X( c

$ n+ v" b, v, z4 l$ f+ I3 v[ 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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1-6 vs 7-12( r/ M. i5 }. f
if 1-6 = 7-12     13 is fake6 _( l0 R; g  X

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Weight the 2 time
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Suppose 1-6> 7-12; q3 M& v2 p4 V( U- y
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1-3 vs 4-6
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Then Weight the Third! g4 B7 q. Z' [7 L( v2 S, ^( K
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Suppose 4-6 > 1-3( F( Z3 p3 B! o7 }6 d# k
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Just like the first Step
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3 Q4 _2 z) s* g4 I# a4 vs 5
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if 4=5 6 is the fake one - X- {: x; i7 h4 R7 B7 @
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if 4>5  4 is the fake one
* z" r" z3 a' R# \* [and so on......................

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問題第二步6 N- [* Q' l' j" g" o# v
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Weight 1:  1-6> 7-12/ z3 ~& J6 {- n0 w

  L; \4 M: ]8 c) {( FWeight 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' A# V3 g2 V, @  s  F8 C& F

& D2 U) k6 u  @' P7 WWeight 1:  1-6> 7-122 c( {, E$ N: t* o4 N2 U

1 K+ r% d1 ~: _7 j& ~) jWeight 2:  4-6 > 1-3
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5 J# J/ U( N. Z- y7 d; L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