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8 D& B4 Z" b6 Z
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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)。) R0 ]" j2 w/ U: o5 ~* G$ x- M2 z
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？』% e2 a2 f" x/ b9 h$ ~- Y3 O
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注意: 7 d, D) ]! d5 k5 S

% \( s+ j; n# x0 M( K' w+ w1 w1. 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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% N+ W4 H* _( e" a' x2. 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) W+ m1 {$ M. x, y' Q
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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:
' b& C8 O" ^- X9 k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,: T' l# P7 G2 n4 n, y4 Q# [
等我搵下仲在吾在% {& c" u- g  h
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當日用左37分鐘答１２粒波子，差７分鐘才合格。, c3 d, k8 o; d4 M) A3 |1 A
13.........
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- [7 X# j  k# r[ 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,
8 n* f0 Z; k0 g- R  X/ k' ^$ v) _2 r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:/ y9 x5 f5 O  q* f
唔識隱藏...已經諗到..

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  n$ C- Y2 Y& {$ xsor !!!....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/ }. M+ [  X% t$ d
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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:
; \* k( }# t! H* U; }1 I: S2 [相信e條題目都有吾少人玩...

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& i  e! b* \$ E) k4 w0 VPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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% V& W1 z' W' `# I3 UThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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) \$ w3 Q) k' E8 D) ?. T' E2 A6 e2 LPlayPlay, Let me know later who has the right answer and I will add points accordingly.3 e7 Z7 W+ E1 U! j1 s
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Thanks

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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

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1-6 vs 7-12
3 v! f8 `* G$ \9 O7 ~if 1-6 = 7-12     13 is fake, |+ _, M0 R, j
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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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8 Z8 b1 m3 G5 R9 r' ?8 a- ]1-3 vs 4-6
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: T, L& U1 W- J, W, c$ ]$ O2 NThen Weight the Third
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, \3 u+ d2 d1 l' ESuppose 4-6 > 1-3+ K: |6 Z- }3 B2 K2 f

7 M/ t  \# ^1 Q1 V0 [Just like the first Step
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4 vs 5 & k; m# v9 K+ v7 x; b

/ H5 |: ?& ^+ tif 4=5 6 is the fake one . x' T: i$ K) l9 |- S! b4 H

2 J& s8 B, o  r- {* [4 [* ~  b  o; o" rif 4>5  4 is the fake one 2 S$ l' I! c7 k# {

; N3 c3 o& j$ p5 t6 o, Pand so on......................

hello1997

分3組4隻波子秤9 o) z. S- t$ x. b

$ \' s  o" _& V4 CGroup A: 1,2,3,41 J$ _# D- B; g% v, l
Group B: 5,6,7,8; l3 o( I6 d, B% X$ r& q0 Z$ ]6 _2 X
Group C: 9,10,11,12, E" \$ t5 n. a& _2 v' ^
Group D: 13
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Round 1
  |3 Q# v6 S) E$ X0 W: x% x; XGroup A vs Group B7 a! l8 Q* p3 y. X* y3 I
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
4 O1 i2 t) p4 [再在Group C拆成:
* M$ N) h& R2 j; }Group Ca: 9,10
+ u; c4 ?3 |' w% U8 PGroup Cb: 11,12$ V0 P  V$ ]9 x
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, , g4 s: w! C8 Q# I# m7 p
要再秤, Round 3, 之後便知答案.
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  K7 v3 H3 }9 ne.g. #1 假設10為較輕的一粒
/ |! ]+ r' Z5 ^* {Round 1' G4 C" p# q/ a) b
1,2,3,4 vs 5,6,7,8 = equal/ {8 n, p  p" j) ~% ]
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Round 2
6 M2 E7 K& d5 ^8 J" |  B. Q3 K- o' h' I9,10 vs 11,12 = 9,10 < 11,12
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Round 33 {* `2 R. @1 i+ h( T+ C( g
9 vs 10 = 9 > 10
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- z' d: V9 o5 N& vThe answer is 10.
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; A" S2 G8 ^2 [& se.g. #2 假設7為較輕的一粒
/ _4 g3 T9 p1 _, ^Round 1
5 i  i$ G* Z- T1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8, v% ?8 ?9 a  W

& n$ N3 u8 l, ?) ^Round 2) T) n2 g2 g% }6 g
5,6 vs 7,8 = 5,6 > 7,8; o5 ?% C. t5 j" q$ l
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Round 3
( s; n+ M2 X3 N, g$ Q: L7 vs 8 = 7 < 8
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, u$ f: [0 W% \% R6 t  j3 RThe answer is 7.
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e.g. #3 假設13為較輕的一粒
9 @3 t% d/ f: n" pRound 1* v6 x6 t# W9 Z& N
1,2,3,4 vs 5,6,7,8 = equal
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Round 2+ x7 n! L8 A6 q8 \6 d
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?! % I; j7 R8 H. L. E. K4 r# X

0 d. g  ]8 V$ J$ I* b( _" c[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:( ?4 }6 ?3 \% B6 O5 W1 i
1.
+ |: I' [; X% R: {9 J6 g2 z/ F8 s8 e1-6 vs 7-12. V# }5 ~! ?" Q6 d6 f3 r
if 1-6 = 7-12     13 is fake' q+ C% j5 \3 f( V$ x7 G" z

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Weight the 2 time 0 x6 ]+ q0 @3 @3 y* H
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Suppose 1-6> 7-12
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1-3 vs 4-6
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7 }2 H- o/ ]* X0 D- {+ `Then Weight the Third1 \6 v, }: O$ q3 x, ]1 Y" p  t
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* u9 s( L8 C$ D0 ^6 P( e2 o) K9 sSuppose 4-6 > 1-31 k7 S! h1 L7 d  A

0 `* n3 B# ?% m# Y4 H; J; zJust like the first Step
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! b6 c  P! z7 g% O4 vs 5
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; P9 M( U. ]) g; a6 m& K: `: x  jif 4=5 6 is the fake one % \) X7 g9 y4 h0 P7 l7 r9 ~% B
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if 4>5  4 is the fake one
* @5 e: n7 e! E2 Y4 S7 G7 n# C" Oand so on......................

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問題第二步
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0 \' i8 J  Y; f6 K- ]/ L% _7 ^Weight 1:  1-6> 7-12! X* g8 ?4 B: h% M; b
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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7 a5 a% F. x9 w$ q4 F5 m8 S你第三步点去搵 7-12 边一粒???
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========================================
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8 t; g1 t' m& D3 C. Q問題第三步
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5 E4 ?1 j3 r% h5 N! t% S6 {: zWeight 1:  1-6> 7-12
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5 m1 I# p( M& d6 W& l8 Q, TWeight 2:  4-6 > 1-3 4 A8 n7 |7 Q& h6 h
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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