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0 m7 P" ~6 s5 {, {6 ?, Y

3 H: s. y/ c3 A  s+ p『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)。
6 d3 {, J( x0 ~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？』0 O. ~3 A1 k1 h9 x' Z( U
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注意:
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/ ?) ~8 g, R) \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# T. s7 [0 f% H4 ]6 c9 b4 m+ ^
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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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. Z# W0 y3 B! v1 e[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:+ d7 h9 I6 K2 {3 C% A  H7 |5 v+ h
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,
: X$ ^1 N- m& \. ]! V等我搵下仲在吾在4 G8 t0 o+ L1 A+ X& e
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當日用左37分鐘答１２粒波子，差７分鐘才合格。3 ~* }% R; u, [
13.........
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! m- r- U) S9 ~[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:7 }, e5 I8 g: s5 Z, ?

) ]4 H2 R! J& g% I4 G我以前畫左個chart去答,0 I9 D4 ?0 D, A$ k  X7 g2 b
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 {6 _4 C' M/ U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! h6 V% ?* ?& h2 `; m, m
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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:& p  q2 K3 R. F0 _2 p" E
相信e條題目都有吾少人玩...

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7 H7 S% o/ I+ d) zPlayPlay, 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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2 i" o3 |  N1 s4 Z; G+ M2 ?5 d不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
9 e- N: ~; V9 B3 y% x. _  S1-6 vs 7-12
' o; G5 z1 B  W7 U8 R: m+ g5 Nif 1-6 = 7-12     13 is fake
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if not
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Weight the 2 time
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Suppose 1-6> 7-12
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5 y2 h& [0 K1 {& |) q1-3 vs 4-6 : }  I8 h& |" l$ N/ j
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Then Weight the Third& w/ I& `0 c2 t
3.
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Suppose 4-6 > 1-3. v. R3 O2 h) n; Z6 L- w. ?
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Just like the first Step( `; A' m+ h; R6 g+ t3 k/ d

$ V( ^+ d4 j% l7 e( S4 vs 5
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) v0 y, _1 D4 N( |if 4=5 6 is the fake one 2 W) ]8 @( N2 C

+ v& f5 _) j6 z* T# sif 4>5  4 is the fake one 5 X) J: z9 {# G0 k

, b! Z% Y; Q2 ~9 N* @7 D7 Nand so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4
  y: T* W# B* E6 nGroup B: 5,6,7,81 o2 e4 }* R' e; y
Group C: 9,10,11,127 ~# z2 p: T4 G0 a; z3 q
Group D: 13
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Round 13 a3 G9 _! ]) g" U8 ^( y
Group A vs Group B  K  x" b+ U! f" j8 b- g# P/ u* X$ E5 D
如A and B一樣, 即較輕一粒在Group C or D
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6 L5 N. O7 |% R: mRound 2  I  {+ T& y9 o, M  x2 Q
再在Group C拆成:
' q5 _" K* u# k" O' JGroup Ca: 9,10
0 y' B5 ?8 Y7 F8 r; HGroup Cb: 11,12
* v6 N3 o1 ?1 ?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,
6 b1 A1 O% u0 F$ C5 G5 X: P要再秤, Round 3, 之後便知答案.% m$ m' I6 x# z" M/ S8 Z

2 q2 u' z8 v8 [. Me.g. #1 假設10為較輕的一粒; k% s, d+ \4 ^0 a8 }! o
Round 1# l. H1 q4 X. M( U
1,2,3,4 vs 5,6,7,8 = equal& X: |; S7 M, w
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Round 25 Z- {9 n9 Y7 G8 q6 \( n$ X% t
9,10 vs 11,12 = 9,10 < 11,12
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Round 3. B  A/ F  i4 I' t  R; [0 i: Z8 |
9 vs 10 = 9 > 10  W: S- y1 u  N2 u
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The answer is 10.9 P; P" r/ z* y  c- B
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e.g. #2 假設7為較輕的一粒
  ]8 H* _5 V! k( ?! T; FRound 1+ O0 I6 J) d! s6 @# e  `- }
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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/ G0 J- q+ b0 `Round 2* a; ]$ t- z$ g/ ^. E
5,6 vs 7,8 = 5,6 > 7,8! k: U, A% J4 ?* d) h+ S6 P
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Round 3* |: r$ O! T+ V4 F5 T/ u3 `# O
7 vs 8 = 7 < 8' a" u' O1 w7 n" s) e  Y

! v% O6 z2 K  V; UThe answer is 7.1 u! C9 S) v  Q9 X' ]

; M% c' I6 @: _4 m- V+ Ce.g. #3 假設13為較輕的一粒
3 s$ E  `5 L& d$ _& n* T4 i5 `Round 1
' Y; z: h! ?8 c1 B1,2,3,4 vs 5,6,7,8 = equal
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& ^' N8 |! c. B! |Round 2
2 ~- @. i. J0 ]4 J9,10 vs 11,12 = equal% k* r( Z6 N- d% p# q+ I/ H" N8 R* k

& P2 L0 k0 Y2 R1 M7 w! @No Round 3
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The answer is 13.% o# x8 ?  Z. o- _7 r2 O1 ]7 T, h

6 d) L, U9 F/ u8 Y唔知我答得正唔正確呢?! % Q6 Q$ V5 B; {

/ K) T. k$ H5 m3 Y+ ?) R[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:+ k& x. h2 z, i: ]- f' k
1.9 m  l. D3 O2 e4 ~7 `
1-6 vs 7-12: [4 v7 J8 q& m* e( P) Q5 W! N
if 1-6 = 7-12     13 is fake
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if not
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1 X& j1 {: H$ X2 S0 k2 TWeight the 2 time " K& Q- C7 l: {5 ^

/ }1 p/ `+ f- V: \/ ZSuppose 1-6> 7-12
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1-3 vs 4-6
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4 W  J1 q7 m5 i; b; A; zThen Weight the Third2 y7 ]" r. ]( c& @9 @$ b% T  [4 o$ ]
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Suppose 4-6 > 1-3* V" b* O0 ]2 p
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Just like the first Step
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  z0 o9 E* q! `/ Q4 Q4 vs 5 . Z- T- O. q+ U/ E' d
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if 4=5 6 is the fake one
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  \1 d8 Y# _+ Mif 4>5  4 is the fake one - s1 M9 ]+ w6 ~+ O( \
and so on......................

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+ I9 i6 U/ n5 I6 ~
& @1 l7 V& X- Z9 U  L問題第二步- r+ X$ t8 \# J, d" j6 S& N/ x

0 Z2 S" ?' R/ w3 L3 {Weight 1:  1-6> 7-12) v( @# ^6 _* L: F9 p
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6+ X  I* u. \' M+ r

4 {4 v/ M2 L& |" `你第三步点去搵 7-12 边一粒???
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========================================
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% {, q& r3 u8 x; j' T$ r問題第三步
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6 m+ |4 F7 K' Z9 V1 G+ F3 w, I' IWeight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3 2 @; l( s  M! D8 Q3 Y

* K( u; B9 W, _0 M/ J. G) x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