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- w! h- h  X. c7 l0 h
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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)。/ h; J' K- T2 {' n+ C/ B
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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3 K- f, D& O) f, u0 @" b+ X& y注意: / v+ ]; A) F; i, J1 j
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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6 h! l) m0 V$ Y2 Q9 y9 f' @! A
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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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[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
% J0 _9 w0 U# ?8 t相信e條題目都有吾少人玩...

  f7 Q" `4 [- q# ?8 I1 K/ O8 r  ?7 |1 L我以前畫左個chart去答,+ s3 Y& `, V# F$ R. P% d8 ?% Z/ H
等我搵下仲在吾在, ?! U8 s8 Y6 X/ U' \, A

) o, x, [' t/ O當日用左37分鐘答１２粒波子，差７分鐘才合格。
( ]* |( F, p) W8 {$ @13.........
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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,
9 u: @  G5 d5 ?; z$ `; G1 a等我搵下...

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: s3 K8 _5 L# G$ l: j( Y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:
  d' E/ E( r/ B/ T! P唔識隱藏...已經諗到..

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sor !!!....e加改左7 g+ W- H& w/ R7 G2 o( @0 r. ?3 n

/ N7 v2 E) t& r# R# A. C2. 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:* }9 g' a* ]4 i% H! j7 x
相信e條題目都有吾少人玩...

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& a5 v7 v! e6 z9 MPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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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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+ o+ |& S4 v2 W3 A5 U4 pThanks

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5 `/ U% m0 U0 u( f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
- H9 I  I3 W7 Q' Dif 1-6 = 7-12     13 is fake
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if not ) i) \+ e6 C% y) D
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Weight the 2 time
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Suppose 1-6> 7-12
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3 k- C+ ]. D- `' s7 `1-3 vs 4-6 0 J8 D; ?2 f" \
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Then Weight the Third/ C& G4 o' {2 h* G+ E# K( h* F
3.
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  F/ d! s' `; X, u& s  E5 wSuppose 4-6 > 1-3: `. X0 e; s0 t. [

( G9 O! M  Y; z/ l$ L6 J! \6 d& t& }Just like the first Step  `/ T6 Y6 h- S2 r& f
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4 vs 5 ! [, V) s/ {7 {/ p, R& A# A
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if 4=5 6 is the fake one
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if 4>5  4 is the fake one
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5 b- X* \% q+ j0 aand so on......................

hello1997

分3組4隻波子秤* g2 A7 Q! ?& ]
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Group A: 1,2,3,45 }7 A- S/ X! ?0 q* f0 }+ f
Group B: 5,6,7,8
; M& X$ k; {) J7 B2 w4 _3 s2 QGroup C: 9,10,11,12) Z( v  B7 I( j7 l, m, s
Group D: 13: o% d- Y! @+ H. h
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Round 1! @( o. x- X, q
Group A vs Group B6 {6 g8 k' s- C: [' o/ j, [( X
如A and B一樣, 即較輕一粒在Group C or D/ E7 b- b  W/ x7 y' r% F5 Y, d
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Round 2
5 A: I& G1 x7 c2 O+ l4 F再在Group C拆成:6 }3 G% v4 M" G0 O# S
Group Ca: 9,10
7 o4 }5 a" v, S' k0 h$ V: TGroup Cb: 11,12
& [# D# |4 n, B. Z: J然後再秤, 如一樣, 即13為較輕一粒.& H* m. r) |4 g9 ^1 D& s1 `! r4 J

; v5 {( j  N3 c0 x如不同, 即較輕一組有一粒較輕波子在其中,
7 T' d8 n+ R( @1 t/ G要再秤, Round 3, 之後便知答案.2 t1 T5 B- q, k9 \& e) d3 L3 J
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e.g. #1 假設10為較輕的一粒
0 ~1 E$ w8 \+ P3 v5 hRound 1) T1 x4 `( J' I. k4 ^! m' g
1,2,3,4 vs 5,6,7,8 = equal
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! |% E9 u4 {5 l& {6 H! WRound 20 q: j4 b7 T2 e# H9 G4 e' l
9,10 vs 11,12 = 9,10 < 11,12) Z/ Y4 I/ z/ {( C. N5 Y5 v

3 w1 L: B3 u/ ^+ uRound 3  f1 y2 o+ t# W. j5 K
9 vs 10 = 9 > 103 Y  q' X. ]" `3 d/ B3 F2 e) s
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The answer is 10.
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e.g. #2 假設7為較輕的一粒
: |2 {) u) h, C7 g  b4 w0 h7 U2 `; M; rRound 1
2 q& f1 s$ ~9 q- w1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8' _& v: D0 j, E' G' o/ F

% q+ ]; F# h9 c. W" w) p+ ]Round 27 b# k; i4 A4 i6 t5 ?8 ~
5,6 vs 7,8 = 5,6 > 7,8. ~- ]/ \4 T4 `/ ^8 ]" r& ^

! U$ d# x, O5 Y  m7 tRound 3$ z$ t" I, e3 r! ]" }2 A; v
7 vs 8 = 7 < 80 @8 m. l0 ^. G  U- h$ H) q/ ]
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The answer is 7.
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e.g. #3 假設13為較輕的一粒) x! m  E" g& e: f: J
Round 1! @$ ~* {4 S7 A
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
) @! I" u8 E. X* t9 i9,10 vs 11,12 = equal
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No Round 3
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The answer is 13.
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; ^( T) u9 l+ Q2 |& [% Z5 H唔知我答得正唔正確呢?! 7 C+ b, K: |. Y& L
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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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" v0 ^4 T- ]- i1 D+ t7 o1-6 vs 7-12
9 X# y) ^" a7 ?if 1-6 = 7-12     13 is fake, ~  P* v6 H& D4 ?0 y: K9 \! F

9 S6 _% E; E+ c9 {' @0 m- fif not
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Weight the 2 time ( R0 ^1 \# @1 \  p- p
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Suppose 1-6> 7-12
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# x0 Y  @  i1 l; q2 R; J/ ^1-3 vs 4-6 - c) C( _6 v+ G+ x% q, T9 _. A
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Then Weight the Third
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7 w6 t! s+ o3 r5 k* `) P/ Y
  `4 X; |, |( DSuppose 4-6 > 1-3
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Just like the first Step
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4 vs 5
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if 4=5 6 is the fake one 2 V  g" F  }+ V5 l6 `

& ?5 }7 Q, T* L6 J. i3 p- {if 4>5  4 is the fake one * c0 Z  _" T1 K7 N8 ?# o, \
and so on......................

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問題第二步- t7 K; N) J' m& H" U

; `. o$ z" S! c& D4 c/ |Weight 1:  1-6> 7-12
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" i* z4 E/ Z5 J1 K6 ~/ ?0 iWeight 2:  1-3 vs 4-6 , if 1-3 = 4-61 N! R& U( q+ Q: u, U3 @; A
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你第三步点去搵 7-12 边一粒???. {9 m+ K6 s( a' }
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0 k$ u0 a5 d8 u/ t問題第三步* Q) B; R* |0 _; {: R" o! Z4 }. _
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Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3 % L* O+ @( w% q; x/ L6 x

1 {% U: n/ W. |! z: X& G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