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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' `: i8 b  Y/ k『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)。; B' F- a8 g, u  u4 H1 t
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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注意:   ~' b; q. a8 g1 q$ |
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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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) w" l- V& B2 @1 d/ P* J" j2. 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0 X  G& V7 f# v0 ?. E6 j% ?, D" g

: @' ~  j4 a8 l- ^* S[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:% H4 L6 b' b) N) ^4 }
相信e條題目都有吾少人玩...

0 o. ~0 R( }$ h我以前畫左個chart去答,
' j8 u; ^! O1 z( I: S) s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。
2 Z; B, g. z# v' X1 ~: O! u13.........  w2 ^* I6 g, A+ c9 `
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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:
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我以前畫左個chart去答,* [1 e4 Y& f% R; ]7 [
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:; P! S# f: b* p0 G, [
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! y: ?. T$ K! q. Q* ]: u& }
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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 o* r1 s4 P/ }, R& U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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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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Thanks

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. _9 T7 Y; K' p5 v! N: k8 ]不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
/ t- c( v) `& }2 N; N; ?1 b0 ~8 O: u1-6 vs 7-128 N8 U1 j; R  M! b2 {* M# n
if 1-6 = 7-12     13 is fake4 S7 K& J3 d! ]7 Q7 }9 Z

+ {: d6 w  S0 C9 a* y' Jif not * d) ]; X7 v8 f5 x0 W) J; Z+ _

: x# R6 w% l* t2 BWeight the 2 time
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: X0 k4 ]8 a; }Suppose 1-6> 7-120 F; u- C' b3 H  @- Z7 O. ]
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1-3 vs 4-6 ' D! i3 Q' m1 V  ~4 Y: f

. K! h6 i/ e' F# \8 R: x4 MThen Weight the Third
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! `5 E9 l9 n! O& z$ |- J9 r) rSuppose 4-6 > 1-3
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+ o4 i+ \/ M5 P' v( j, gJust like the first Step
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& ^# P" Q+ S- O) u; S4 vs 5 ; [7 D' S+ o# B" l: I) X! J

# c( e# I/ z/ G4 f* }% S, Zif 4=5 6 is the fake one 4 Z5 R+ e# J- ^' k4 C( O
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if 4>5  4 is the fake one 8 _& u) A$ i1 ]* z& L7 G

8 `8 v  p' m0 g# ]" Jand so on......................

hello1997

分3組4隻波子秤4 E" q" W3 r+ n5 X( ]* V
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Group A: 1,2,3,4
. i( t9 ?) y- h# A3 y1 ~0 c9 E, ~Group B: 5,6,7,8
4 w5 ]4 K' e  s. XGroup C: 9,10,11,12
7 ~1 h' B+ y0 p2 P$ c: e+ BGroup D: 13; u0 r+ M' q3 |# d1 N6 [. Y8 b

7 L& |* J9 n: [8 PRound 1
$ n( \, z+ z! g" QGroup A vs Group B" i3 g- m- U: m8 g# {2 }. [( v
如A and B一樣, 即較輕一粒在Group C or D
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5 o" t" E, J4 t$ l, p* G# sRound 29 x1 [  ^6 y7 r- H
再在Group C拆成:2 t) L1 V" U! B$ B- P) ^2 N
Group Ca: 9,10
+ m, B1 B+ e: m: \& Q/ ?' N4 xGroup Cb: 11,12
& X" W# P5 E5 c然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中,
" U; X  O/ z, S! f1 b: V# @5 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
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& U( x6 V5 g0 _% Z, U4 M1,2,3,4 vs 5,6,7,8 = equal
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$ F' ]' ?5 T) z% b& k3 ~4 M7 I& PRound 2
- a0 q1 x4 ]% r2 N" ?7 A9 R5 R; |9,10 vs 11,12 = 9,10 < 11,12
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8 S: V+ Q& ^; M9 j) f, A( [" ORound 3
! n* \9 ~& \- f9 vs 10 = 9 > 10
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; z0 X  `9 ~5 m0 ]/ x6 C7 z: vThe answer is 10.7 v  V. r- D2 Z  r
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e.g. #2 假設7為較輕的一粒
3 \5 Y6 y; d" x! w8 tRound 1
1 U1 L) `+ H) E# R. ~, q1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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& P+ _5 Q. n) ORound 2
- ~$ S+ @3 j; q1 q" o/ A" p1 }* ^5,6 vs 7,8 = 5,6 > 7,8
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% E1 z" O- }! M# E$ s8 B% rRound 3! z0 H" |, s5 P( r: _: ^
7 vs 8 = 7 < 8
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The answer is 7.1 Q, D6 }2 n& n6 T
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e.g. #3 假設13為較輕的一粒3 }+ ?$ _8 U2 i& P* B% _' Q4 w- F
Round 1
/ M  ]( I1 `/ f1,2,3,4 vs 5,6,7,8 = equal% k: @: E6 {3 h9 e

$ z9 B  i( H( N% g& rRound 2
7 T" p2 R' N& i+ X9 e9,10 vs 11,12 = equal
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No Round 3/ \' z9 X0 b+ J, F' F5 ]5 J

) p+ ?) |; i7 a, rThe answer is 13.% p, ^7 v5 j: M: A, g
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唔知我答得正唔正確呢?! 3 y" B1 W$ |# q

8 P% E2 W' V$ l[ 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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" o( V/ t  G: J- A6 X1-6 vs 7-12
- ^' {" e/ H, D/ q# Z% hif 1-6 = 7-12     13 is fake) Y* W; G7 ?  G* i- \
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if not " s7 S+ V% n/ h$ `* H5 V
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Weight the 2 time 7 d* W' N# s$ ~& K5 ]

5 D# q; b* @8 _# X0 |1 U' \% [Suppose 1-6> 7-127 H# N  y3 m' i' `6 C1 p
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1-3 vs 4-6 6 Z3 ~  \% C1 F0 e9 g

+ m$ x: f9 F! q, F5 PThen Weight the Third8 ?; L0 D# M! g4 D- y5 B
3.
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Suppose 4-6 > 1-3
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Just like the first Step6 z6 Z% z1 X5 X0 O/ M
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4 vs 5
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if 4=5 6 is the fake one - q5 T$ C% Z+ f
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if 4>5  4 is the fake one ' N7 P; Q7 f! Q- f9 `
and so on......................

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問題第二步
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Weight 1:  1-6> 7-121 I3 V! Q" |% U4 P0 N& f
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Weight 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???9 I/ U* ?1 O0 g

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* S) H5 `" w2 {問題第三步
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Weight 1:  1-6> 7-12
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/ \  }/ Q8 s2 `8 }Weight 2:  4-6 > 1-3
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5 i! G$ B0 a4 x( I& K+ K% D& c8 N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