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)。
4 u! v* Y) I/ ^3 G4 O- E2 P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？』, L. U9 H7 f% `8 f( n

) r% Q6 |4 q5 c* \+ d注意:
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& l( ^# y' `/ z# B# a) x! ]# p2 M1. 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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: C: U& q, u5 Z+ z2 C" R6 _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 21:34:6 v) Y" v* ?; @: f4 k! F; a2 [
相信e條題目都有吾少人玩...

$ n4 k6 O! j: p# B0 i4 a我以前畫左個chart去答,
, a" M7 r& s! O* @' k$ q等我搵下仲在吾在$ X3 h9 N) n- y$ Q+ q( t% G5 ?9 C; O

! U( \8 C8 ~9 h3 P9 }9 N. X) y當日用左37分鐘答１２粒波子，差７分鐘才合格。
1 {/ s3 k8 O! ~, l6 J13.........: M2 |1 f& b6 i& E3 O

2 R$ e. `0 d1 P4 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:( L" K3 Q& k0 k  W# B* C& \

& d- m: H' X( y我以前畫左個chart去答,
) @( ~3 ]6 b" g等我搵下...

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% e( a3 R: G7 @( l+ e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 A/ b- L) l. D. @3 O5 t2 g1 S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: d: v' f2 l7 K' `; Y+ ~
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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:+ T& K" ^: E/ j) v9 b( @) Y# h
相信e條題目都有吾少人玩...

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5 s3 l2 o6 g4 I0 T: C8 Y1 _# GPlayPlay, Let me know later who has the right answer and I will add points accordingly.  }% t/ y7 O, l& V

) R: Z! Z- Y3 ^$ f5 N+ d8 GThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:% z6 O% X4 g$ ^3 }+ j
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* R/ `, X& [2 F1 s: ?" jPlayPlay, Let me know later who has the right answer and I will add points accordingly.! z. G$ j+ _& ]( }; r
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Thanks

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0 M9 d) l% C; e, `( F9 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 7-120 O* \% ]0 u0 U' I6 p& H" a" J
if 1-6 = 7-12     13 is fake: O' A: |( i$ o  B! [- \
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if not
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Weight the 2 time
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3 x: u, m" D' ^Suppose 1-6> 7-127 I4 n. v" L# a7 ^4 R

, m  p- }6 X. q) g3 b8 ]/ ]1-3 vs 4-6 0 S( }( D2 C2 r' x; V
  i& g, y% M7 P; r
Then Weight the Third
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Suppose 4-6 > 1-3: `( u5 N& p1 @/ o) T

2 \2 C# d4 Z8 D$ X+ {/ `. k; GJust like the first Step
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4 vs 5
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if 4=5 6 is the fake one ) k* h9 n3 l2 m: i  [3 p- o
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if 4>5  4 is the fake one
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0 \5 e- j1 M; r. S( d! mand so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4
5 v3 {% B7 b7 U3 ]Group B: 5,6,7,8
: ~/ W6 [% V6 C. P' N: mGroup C: 9,10,11,12
5 S/ f& [. y$ N. B6 G* NGroup D: 13) A: b* P# S& e& s9 l
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Round 1
8 l7 f, v# q# nGroup A vs Group B
/ S0 B, v( N7 U; `如A and B一樣, 即較輕一粒在Group C or D+ m! w! W! j$ _# g, }& |
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Round 20 \+ |9 e: n" s
再在Group C拆成:; T! w  }. \! @# a+ r4 {8 E+ w: a
Group Ca: 9,105 e% r, q! n5 f# f2 [: [( ~
Group Cb: 11,12* d( m- a5 x1 ?8 P5 j! {
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, ; E5 P& A- p6 O" A
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, \: s8 L! x& L
Round 1; l3 u9 B9 l* X5 h% ^3 m
1,2,3,4 vs 5,6,7,8 = equal  `+ b3 U) y% Z( Q) Y$ o! A8 ^
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Round 2
; W2 k- D) G6 ^7 W( W) D# j0 v% b9,10 vs 11,12 = 9,10 < 11,12
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Round 3
0 j# o+ R" q; V9 vs 10 = 9 > 10' e, j( ~+ X0 d& M, v

- {# L7 J3 y4 s/ UThe answer is 10.* R! k8 k7 }: M; @6 A

2 }# E3 f  l5 D) I4 _" he.g. #2 假設7為較輕的一粒0 ?5 ^# F) Y9 W1 G6 J9 `5 T+ M* b* v
Round 1
6 k3 L% I) ]' [4 b: S1 k1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,82 e" p% C/ Z( l# a8 s( W

3 F" z+ _  b0 ^# ^9 e; d- URound 2
, \( k9 V+ a& n# D) d5,6 vs 7,8 = 5,6 > 7,84 S% ], O$ B# Q- B
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Round 3! |0 m% P  J' g7 t( x9 W9 M/ ~
7 vs 8 = 7 < 8# r8 k: s" M! D% }6 [2 G3 T
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The answer is 7.
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* |2 v* A. c6 ye.g. #3 假設13為較輕的一粒
; `8 L6 ~# }7 Y) G# c6 @Round 1+ x1 A3 g# t6 S& C: l& B
1,2,3,4 vs 5,6,7,8 = equal1 c" t0 D; ?. @7 y/ ]) v: l5 T% B
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Round 2$ f2 }; j, m! }) ~$ H) p8 ^' B
9,10 vs 11,12 = equal& `- p1 ^$ v9 B
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No Round 3. F; w/ h1 f; h% f( s9 X+ A9 f/ t8 ]

( B( j0 |" K' }8 h- pThe answer is 13.
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( m* H9 }3 E3 x* f唔知我答得正唔正確呢?! - f. {( \, H5 P8 t- u1 ]. ]" C
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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:/ s+ Y3 Y, g* `, @) [8 H
1.& a  ?+ K4 D& A  u- F* E( m
1-6 vs 7-123 T* d4 x% ~/ R. c  z
if 1-6 = 7-12     13 is fake
2 A6 r% u3 T3 r2 V+ s2 j5 x3 D" C2 \- N( g  R4 B0 i6 `- k. u
if not
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Weight the 2 time ! w& J6 _9 Y1 A

" Z3 n& j7 X: J/ ?+ eSuppose 1-6> 7-129 [9 Q- [/ h2 U6 p
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1-3 vs 4-6
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) t6 `% s/ z# O0 S2 D1 Y0 J& D  oThen Weight the Third
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Suppose 4-6 > 1-34 V2 \4 j# k4 E4 b

: j8 m0 M0 E- V2 J% z. ?/ V# {5 nJust like the first Step
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4 n1 G% M1 m2 Z7 L  m1 b* ?1 x4 vs 5
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; @9 |% D' L) ]! d; Z% Yif 4=5 6 is the fake one
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if 4>5  4 is the fake one
+ ?# R; }& B4 H, N+ {and so on......................

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% z7 L, q% I( h  S- ~. Y問題第二步
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. V0 _* p& h" {$ O( J5 IWeight 1:  1-6> 7-120 @$ W' n$ |* H/ Q) W- b  d* B

4 F0 }  f: G+ \: q1 U$ cWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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# @9 f8 W5 f# u! w5 G你第三步点去搵 7-12 边一粒???
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========================================' ^# O4 o- T+ Y& x/ [9 u5 [& }
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問題第三步0 }( z1 @4 S0 N
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Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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: G2 _1 `( z0 ^7 ^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