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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5 M* Y/ w) p9 ]6 z! I『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)。5 R' G# E0 ?( C1 G
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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; U+ [* b% |9 a' l) j注意:
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' X- `8 j/ w) y  |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) D) O* k5 n+ Y9 C  e/ z

' {4 |. ]: b: b% f. o2. 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' G" g4 s2 I' C
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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 21:34:4 i) `* n/ w' w( V
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,0 y/ t# L" Y( `. e7 F* S
等我搵下仲在吾在
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( W' B' \+ p$ i當日用左37分鐘答１２粒波子，差７分鐘才合格。$ I( f& F  y; w
13.........
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; `/ `6 A9 Z. k$ m3 C1 M[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:' V5 H6 g& [! u3 X5 m8 b! b9 z
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我以前畫左個chart去答,
" P  K: y+ |  v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:
* [3 H! ]; i7 |- s9 U唔識隱藏...已經諗到..

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sor !!!....e加改左
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9 v# u0 S# N, `9 s2. 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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. {% E: S6 o( f) F: i[ 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 R% C( l' \# A' ^& O% o相信e條題目都有吾少人玩...

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" K! \, t- K( z( qPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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3 ?# v0 r3 f) T0 {& y+ VThanks

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.; o& d) Z* w. O* i1 ]6 e
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Thanks

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3 H, R  ~8 t+ |! e, R不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
1 @3 B6 E; Q$ q- J7 @8 g1-6 vs 7-12
' A  n: a6 l4 l1 C  Bif 1-6 = 7-12     13 is fake0 F* a5 a; C" s$ B- ~& E& C
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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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! ^1 h, B. N' O! n: `6 z1-3 vs 4-6 " Y$ v% k( w; d  a. {% B( `8 ^. ]: e

2 }$ O" V% P3 V+ ?& bThen Weight the Third
0 Q  b, s, w* \/ E5 O3 @1 a1 c3.* J" h& [; Q4 c5 K8 t6 W

5 _. W3 R8 D$ `* c& x* RSuppose 4-6 > 1-3
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Just like the first Step1 m3 T/ G* I1 k& H! |

0 `! g+ s& c8 x# F% t4 vs 5 - v$ n: V" u# g8 k5 B: d5 `
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if 4=5 6 is the fake one
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- o( R3 D2 L' T1 ]  jif 4>5  4 is the fake one 5 M: U$ [0 _8 a8 [- j+ }

  H; \$ I. ^5 K. J/ ]) C6 g* sand so on......................

hello1997

分3組4隻波子秤1 [& ^8 J3 q$ Q, i/ {" L

! K0 _1 L% U  [% m. J# }Group A: 1,2,3,47 l! v  g6 E2 \+ q, a
Group B: 5,6,7,8+ x1 d* f, d& ~6 \
Group C: 9,10,11,12. n! T6 o% @$ q6 Z
Group D: 13% Y7 P9 t2 m. h% m1 u3 u% ]5 \$ B

6 k; H3 F) y: B. d' L) E, B* mRound 1
4 P: s2 s$ Q; L  kGroup A vs Group B! O6 ~% l7 U) |5 l& s$ r
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
, q7 y( N  C! M再在Group C拆成:
( ^  W( ]' c# ^: t6 z) `Group Ca: 9,10
  ~. P. A# Q8 d: N1 N4 l4 L  SGroup Cb: 11,12
! Y$ [8 @( J; o+ V) W- c然後再秤, 如一樣, 即13為較輕一粒.
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) {0 C5 X+ Y+ w# M如不同, 即較輕一組有一粒較輕波子在其中,
7 w6 {% F* u6 Q: o2 h+ K要再秤, Round 3, 之後便知答案.- _& l1 x2 w, C6 g) W- g) w6 b
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e.g. #1 假設10為較輕的一粒
! t" l6 X2 [9 v$ S, YRound 1% v0 |0 d/ F) D) m
1,2,3,4 vs 5,6,7,8 = equal
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- R1 F( Z4 a& j* S& \Round 2
; ]% P- X. G0 W* _8 |8 v9,10 vs 11,12 = 9,10 < 11,12
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Round 3
+ x0 t+ n* w; t+ y( E9 vs 10 = 9 > 10" D; G6 @4 ?3 S; U% f

& G0 F  @3 H' bThe answer is 10.# j- ~% K' c% K+ i+ B& p
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e.g. #2 假設7為較輕的一粒1 P6 O; G2 [: R' K5 g! F' W
Round 1
: g8 D/ s/ E2 K: N1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8$ T3 Z" u4 B. J: B" K, R& p
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Round 2
5 k# I9 T# E8 k0 ]" y5,6 vs 7,8 = 5,6 > 7,8
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! T& N1 v+ @: p* l& |, X1 A9 T) yRound 30 J, j, ^) S0 O7 u. Y3 ^7 S
7 vs 8 = 7 < 89 t) I& G" y( g9 M4 k, U) M9 i
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The answer is 7.+ }* ?* y5 p& V" G! ?

2 }0 o( m9 y$ N$ Ye.g. #3 假設13為較輕的一粒
( I$ W1 m- j! |0 f6 S" W+ k1 P$ R% G. hRound 1% K, ]" w0 _0 ^6 y4 L+ p
1,2,3,4 vs 5,6,7,8 = equal
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, _  j( a* }- }; n" V  sRound 22 f" n& A( y7 j- `
9,10 vs 11,12 = equal
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+ U* b* y+ x# N9 BNo Round 3
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The answer is 13.( W% D; I7 @% A( e, K, |0 a

# _) `/ a. G8 X! _3 d0 g4 |唔知我答得正唔正確呢?!
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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:4 n3 o) e+ a& {" t' t
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1-6 vs 7-124 w+ t' l% ?& A$ i3 D; C' I
if 1-6 = 7-12     13 is fake
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Weight the 2 time
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Suppose 1-6> 7-12: v+ q2 O( |4 i; U" Q9 p' K

$ [, n5 K$ c, R4 W1 `; E+ R% p9 A1-3 vs 4-6
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& N$ ^, A- D" p  m+ bThen Weight the Third6 U$ `4 r1 W) D2 x
3.
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Suppose 4-6 > 1-3
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Just like the first Step9 H) m' F7 T1 a" ^* j
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4 vs 5 " [$ \) M8 Z5 T8 R% |

- }4 b, D9 `* B! e' ?7 S+ _; Fif 4=5 6 is the fake one # z; W$ q7 L3 z& O" U. h) Z& z5 {

+ r: X, w  j5 n2 |3 ~9 M0 ?if 4>5  4 is the fake one 8 p4 X# r# D! \4 B$ E
and so on......................

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! W0 L5 O+ n5 H) u2 q* z; k  \4 e( `. ~問題第二步
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Weight 1:  1-6> 7-12
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6- q# n3 Z* V  `  S6 N
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你第三步点去搵 7-12 边一粒???
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========================================
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問題第三步
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5 r" A" _2 x% g5 x( K% i) {# s6 ?Weight 1:  1-6> 7-12; `! V3 t  [; G
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Weight 2:  4-6 > 1-3
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3 L9 m5 N$ k. s3 J# A+ A( d# C1 v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