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)。
% d( k9 c8 @0 t$ q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？』7 r. W$ E/ S. T7 I& W3 |1 z. R% Z
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注意: ' h; T4 n4 r# m. h
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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
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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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7 P# J6 y  E! n7 X2 S3 r[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:: f" q# P" O7 ~5 U, W
相信e條題目都有吾少人玩...

4 Z/ w3 s! H/ o7 C8 S* L1 J我以前畫左個chart去答,
6 c1 b! i. s; _$ \) @等我搵下仲在吾在' |% Z) V+ j8 Z( }  N* ]4 q
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
* L7 S+ q$ h, ]' }$ x13.........
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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:* a8 {0 Y* N. }5 B1 Q
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我以前畫左個chart去答,
4 x% [: g/ x7 l# c5 u6 H4 o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:
  Q& x4 Z, X3 w% e1 |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
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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:
. `; Z2 p# i' e& n相信e條題目都有吾少人玩...

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" I( `3 l: G" |+ vPlayPlay, Let me know later who has the right answer and I will add points accordingly.1 v% E7 u* U4 N- f7 ^0 p& r

( E7 k2 [. P3 @' Y& aThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:0 I9 E$ u+ d8 C5 e
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PlayPlay, Let me know later who has the right answer and I will add points accordingly.6 J6 L* W1 ~9 V  Y0 ~) D
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Thanks

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9 b' @8 [( t5 w& }+ ?9 Z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' ~; P- \) E% s  K3 }9 Z
if 1-6 = 7-12     13 is fake
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if not 9 a3 C& j& p3 d3 j
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Weight the 2 time 1 Z6 N9 [; w( i- r

7 s! r! {8 H: \3 l) Q  ~. B' kSuppose 1-6> 7-12
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1-3 vs 4-6 % ^+ Z9 _3 a' k# F/ w3 r. j6 i
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Then Weight the Third
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$ s4 T) e. W$ x( e5 XSuppose 4-6 > 1-3
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Just like the first Step6 L1 L9 ?# f  [3 N9 B, Y
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4 vs 5 ) x7 O& C) H- e" Q9 r1 E

7 i: R% }6 e- |# p+ B' lif 4=5 6 is the fake one 0 N% X, }* \6 x9 Z+ W& i

( K% ^* J' [, x7 H' g# Sif 4>5  4 is the fake one
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; C) J5 [: g/ ~6 X6 `2 m( [. \and so on......................

hello1997

分3組4隻波子秤+ O0 I' U% |$ @2 d: j+ G9 o( A
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Group A: 1,2,3,4
4 x; X+ N" M( t9 x, }Group B: 5,6,7,89 r3 c0 c0 l. a. H# V
Group C: 9,10,11,12' b- A1 ~( H$ b5 t9 c2 D0 d& [
Group D: 13  {5 L( @' E" ]  y3 r
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Round 1
2 k/ D; K' h2 ]Group A vs Group B: h* q+ r% }4 P; L
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
# |) C' O  |2 h. t0 B5 b再在Group C拆成:$ X' ?" P0 M1 |, o, n
Group Ca: 9,10. J* a; ]( b" l$ ]2 K
Group Cb: 11,12
0 m# [% F+ A" x3 Q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, # S+ J. G( L1 X; s7 B# c
要再秤, Round 3, 之後便知答案.' |0 v/ X( I$ p" S3 z* q7 {  b

  L6 E. o0 P+ }% o; n- [e.g. #1 假設10為較輕的一粒
8 |3 R+ J4 o6 @; _( v! B. f2 x0 j0 yRound 1
, C! Q- b8 D4 A" B: F. _1,2,3,4 vs 5,6,7,8 = equal- B' {% x- d) T: m' y

* P3 T; c* l/ x7 q3 b' KRound 2
: q7 z: u% n  F( M6 x9,10 vs 11,12 = 9,10 < 11,129 g4 A* Q7 Y3 A6 I4 B/ t; o% p

7 q8 y, j  V& L& q" vRound 3" e7 ~6 E1 d0 h2 x3 O. o5 z
9 vs 10 = 9 > 10
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The answer is 10." F# J, e* b  w; B' A

! q  D: v3 Q; d  I' d6 je.g. #2 假設7為較輕的一粒* {$ F( U/ K; ^2 J+ d0 c( O
Round 1
$ B4 M$ v/ ?/ m- V& @3 F2 [1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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  m- M1 g: @9 b: l# ^Round 2% q% ]2 M9 ~7 m5 ~# X# v% F% A3 {# L
5,6 vs 7,8 = 5,6 > 7,8- _9 u8 U; X) q) X

5 S! l7 y/ m9 d& DRound 3
: `% N; m3 G, P7 vs 8 = 7 < 8
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$ W" Q$ a2 e" i6 d8 fThe answer is 7.2 P) N' k( h8 l8 q

) w" \1 U5 W! j" s# w+ t! }; v" Ue.g. #3 假設13為較輕的一粒& |. o8 m$ t! h7 a$ m! O
Round 1( g% Q9 m' O& Y( {2 _8 M0 ^
1,2,3,4 vs 5,6,7,8 = equal7 w* h* B  h' {* W  ]

/ ]0 p/ k; z* P/ `1 BRound 2  W/ q7 q$ C! {7 A! M2 d
9,10 vs 11,12 = equal
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% `, V' P  |% x  |& NNo Round 3
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The answer is 13.
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- c2 H4 V5 ^" z- n唔知我答得正唔正確呢?!
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' J$ v+ n+ m" U3 g[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:" }7 H! a) P, z  m+ j; k* Y* ]7 U
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1-6 vs 7-12
- S1 z  h7 [9 W0 dif 1-6 = 7-12     13 is fake
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& E* l, E) ?* g2 Y2 y5 uWeight the 2 time # p/ K( z0 \* Y. j2 h) G/ {

% a+ L4 h& q- |/ A$ ^Suppose 1-6> 7-12
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# m% K7 D9 \) C; S9 g6 F. w1-3 vs 4-6
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Then Weight the Third, I- r* O) _- P) P9 K  [7 @
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$ m" f' o# O4 L+ X' O. }Suppose 4-6 > 1-3
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6 t7 ^( p8 G0 XJust like the first Step
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) W0 \! ~0 o* K# t7 y4 vs 5
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+ @1 \3 L* H* j6 Cif 4=5 6 is the fake one
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if 4>5  4 is the fake one
, a8 v6 }. X& J1 }5 _and so on......................

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問題第二步
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% e* d5 r3 e7 i$ d( a# y  W/ Y) @Weight 1:  1-6> 7-122 X  r: t$ \  y8 }
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6- E  @+ j6 b5 P& `) e) W1 z% _; \

. B( |: j& I/ c& g7 k' Z你第三步点去搵 7-12 边一粒???, N2 I- v0 _/ G; F9 q9 G7 \! q
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========================================
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8 v& A" q, k% H0 r問題第三步& B3 w! M$ o" ~. o0 j% \7 D

8 ?  \3 D: i! R8 l- n$ o3 L4 dWeight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3 1 X) j& k# R  v2 C

$ J4 D% R0 u4 m; T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