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. |: K* V- Z# c- H3 m2 ~1 F

; M0 D, ^0 k, a『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)。# V9 T  d+ q: h+ C# |) |+ g7 N! e
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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  ~/ }- ]. r6 n$ x! t注意:
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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1 y( r2 @( K' Z5 D1 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:; l5 z: g- _/ g: C3 i+ u# {* u
相信e條題目都有吾少人玩...

: w" ?; ^8 w6 B我以前畫左個chart去答,
  q! }8 E* }& B# b" G等我搵下仲在吾在7 s! @; y; T5 i. ?

2 G) Z8 N" s* |* m' C當日用左37分鐘答１２粒波子，差７分鐘才合格。
( r2 S5 Z7 \0 z, b13.........3 E( |6 n5 ^5 `8 a, _' [* P7 k
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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,
3 t, S  U- q  N" O等我搵下...

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& ^! j' w: f& n* `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:
: G  M7 Z9 ?3 }" ?: ?7 l7 v8 Z唔識隱藏...已經諗到..

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3 G" {/ W. j8 I, q* R5 Tsor !!!....e加改左1 |5 D; I3 g% T/ ?! d5 o+ W
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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
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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 A: E7 H+ [2 n5 F6 r相信e條題目都有吾少人玩...

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PlayPlay, 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:& @% O2 T# @" O* J* x8 b
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9 w# s0 k' P; y: Q( `; B$ xPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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  E* R5 X4 s+ X5 YThanks

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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

1.
/ p) f/ z# j; H0 j4 m/ v8 \. e1-6 vs 7-129 y8 }4 v) Y! l$ r
if 1-6 = 7-12     13 is fake& R/ [; N4 q9 j" @" z) P) c
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Weight the 2 time
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Suppose 1-6> 7-127 b) l6 c) O$ G, ^; k7 T
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1-3 vs 4-6 4 Y* L, l# l6 [5 U* b

( A- k% i8 j$ HThen Weight the Third6 j* ~- l8 ]5 ]  g7 e
3.
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1 G7 m$ W% g  t1 y/ x5 q( Q' e4 zSuppose 4-6 > 1-3+ n/ K1 O4 l# p* t4 R: T
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Just like the first Step( f# V: p, Q$ |6 w' d
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4 vs 5 1 J9 s2 F" n' F% E, r4 v

7 C* `$ [: Q! t4 ^if 4=5 6 is the fake one
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if 4>5  4 is the fake one 9 m. i& k4 P: {; N2 M4 P
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and so on......................

hello1997

分3組4隻波子秤# x) Z9 H5 N( a% F1 r/ k* P
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Group A: 1,2,3,43 f8 _' w5 j* a$ D
Group B: 5,6,7,8! R- |; \  u6 X% H1 u' x
Group C: 9,10,11,12( f  ^2 ^$ j) b, c
Group D: 13
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Round 14 T% s9 i& R: U: K! t
Group A vs Group B5 ]3 ^, D9 G. l0 s
如A and B一樣, 即較輕一粒在Group C or D" m( i. i. E* D2 o

1 q" T9 e! [# e0 X, wRound 2& Q1 G7 t- D0 K5 f4 N
再在Group C拆成:
% S) a# c' t, ]9 k9 YGroup Ca: 9,10: i; C9 z/ [9 v3 g: c# M
Group Cb: 11,12
7 ?/ z' H; [/ v0 z然後再秤, 如一樣, 即13為較輕一粒.
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6 ?$ p* R3 p; i5 i  [2 R. K7 z如不同, 即較輕一組有一粒較輕波子在其中,   B) I% _$ A1 ]( W
要再秤, Round 3, 之後便知答案.5 S4 N: r6 C% B' s, L# w! [  D
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e.g. #1 假設10為較輕的一粒
  ?, I- v* a+ R4 W" @; ~5 ]. pRound 1* \# M# n" w$ N, U$ u
1,2,3,4 vs 5,6,7,8 = equal  H( ~7 h0 @( @- L3 v: Z9 ^* L

5 F+ u3 n) P6 A$ lRound 2
1 o9 \5 ]" J- H0 ~! K0 A. H9,10 vs 11,12 = 9,10 < 11,12
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% H3 D8 U0 l/ u2 {1 ERound 3
3 Y& J& Y9 u0 k1 w' F" v7 S: N9 vs 10 = 9 > 10: T4 {; h7 a( T& d8 K$ f& O

# F- G- f- ~3 h' U0 [3 xThe answer is 10.
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e.g. #2 假設7為較輕的一粒
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, l! ~0 m% x4 x' n5 f' @0 `5 C1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,88 Q5 j* D& A1 d4 z1 O$ N/ g, Q6 X
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Round 2# t6 @6 J/ j" O
5,6 vs 7,8 = 5,6 > 7,8
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Round 3; ~3 {) w" B( }3 n
7 vs 8 = 7 < 8
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The answer is 7.' X" ^. J6 d' i3 Q3 k5 h

' `# M; ], c% ^- t$ g0 Ie.g. #3 假設13為較輕的一粒( T& i4 Y1 B' N, Z3 W" w
Round 1: |  [9 o+ Z- d4 Y- [  S: |
1,2,3,4 vs 5,6,7,8 = equal
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3 o1 [  I) q4 b9 HRound 2$ e3 \) m% A4 I/ b5 @
9,10 vs 11,12 = equal5 E0 H3 Q% ~& V1 U- v" e& ^

5 K1 O- z1 `& r1 qNo Round 3, V& C, H. Z/ _+ G0 u: u
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The answer is 13.3 X" P7 `# T+ a3 u; r
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唔知我答得正唔正確呢?! ' T. n5 p5 n3 J7 s. ~; l3 U. R
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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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" l6 k, X0 Y+ U: j* k& h1-6 vs 7-12
* b; h2 P0 `2 j5 sif 1-6 = 7-12     13 is fake& F- p0 H; ?+ |& p6 }( u% z

  Q& v8 h* ^% \! x0 b6 `: U* H) rif not & E# n0 s7 o; e; W0 f$ o

( y; ~2 Q/ N- E; I- qWeight the 2 time - F4 g' v; b7 B1 C+ K
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Suppose 1-6> 7-12, \- O& D# a& s; \# P1 v( h0 T# T
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1-3 vs 4-6 ) s# M. O) f: y; G; K4 {) E( W  b

% W7 y4 Q( f0 ~6 v8 Z3 q1 q  _) N1 a6 GThen Weight the Third
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Suppose 4-6 > 1-3
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# |0 f0 C9 H% `( p" e! TJust like the first Step
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if 4=5 6 is the fake one
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. R/ M2 C: u0 A$ P) sif 4>5  4 is the fake one
; r! u0 M6 j+ [1 m' Jand so on......................

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問題第二步
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6 Y0 o4 \" T7 T; X9 N$ EWeight 1:  1-6> 7-127 L' T1 R! m  T
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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/ F8 z/ n! y* z/ Z你第三步点去搵 7-12 边一粒???- I" s* N. _2 y5 G% {" g

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% D& v5 |5 _5 u. Z" c) L# y問題第三步  p0 m! K* U4 I1 ?
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Weight 1:  1-6> 7-120 J8 ]! n" R4 q. y  e" B
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Weight 2:  4-6 > 1-3 8 Z- X0 \7 H' a

2 ^5 g$ X1 ^: s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