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)。7 ~8 p5 }, j' Q5 O
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？』5 @* R; E7 y/ t7 ~

# Y' u9 E# B& B* y; _注意: - m7 _- F9 m& A) a) e
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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/ ?( A' l; B, h! b! P2 H

" ^7 z$ P+ c( b! H6 p  G2. 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( U# F* [5 d" ?7 m& O

! Q9 c9 z. e- n, Z8 `[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
9 _3 G7 N. W. a3 R' K9 ~8 p  w相信e條題目都有吾少人玩...

" ]4 h4 B5 ~* L7 K/ ^我以前畫左個chart去答," \$ B  i. J. J% D$ c
等我搵下仲在吾在
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當日用左37分鐘答１２粒波子，差７分鐘才合格。# @( T4 n; L4 p% h" U* _
13.........  K4 }5 a! p/ P
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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:. E4 C4 X* A% w. i# H
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我以前畫左個chart去答,& u, I  {. H' t$ m  _- x
等我搵下...

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' ?4 V: A( q8 Y3 a  _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:& T0 k  ^# O  e6 X3 D$ g+ M! q: @
唔識隱藏...已經諗到..

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sor !!!....e加改左, B/ K. r! m$ c5 E$ Y7 Z

4 t/ D2 M8 A  S% |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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9 y) V+ _/ D+ y1 d! m7 y[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
4 E: _. z; P- A1 P) V8 e相信e條題目都有吾少人玩...

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* a$ y( v7 Z0 j1 D: _5 o6 B( Z3 p: i* uPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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7 l+ e9 q! y4 j9 X, V' Z6 DThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:6 d4 n6 w2 i& T0 t& m1 Q; B

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9 _+ R. y' @% a# @+ a- J2 ~PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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8 E2 H  p) u/ X% K# u  aThanks

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$ c1 v7 n( g5 J5 s6 `0 b, h: f9 y不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.5 r: \! g8 `( |4 U. }9 b% F% Y
1-6 vs 7-12+ v: b. X: O$ u" F
if 1-6 = 7-12     13 is fake& ?; E- }( D) i; F
2 `2 q0 d+ i2 p( ?
if not 3 N& B' ^$ M# q+ n) B9 M" Y
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Weight the 2 time ! T: F: G' f* i) T- T5 C

3 d: E* l! Q. k  zSuppose 1-6> 7-12  i$ W* T+ h# c+ Q9 u2 A! v6 b, x
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1-3 vs 4-6 $ n8 u& G1 \3 t# N% i; b
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Then Weight the Third
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* w, S. E1 `. {$ y5 I# ZSuppose 4-6 > 1-35 o) M# m, X4 [) o. h$ I, S+ g

: r- o) P. F, K: kJust like the first Step& v: I7 Z. C7 i1 c! i: a) c1 h
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4 vs 5
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if 4=5 6 is the fake one ) v% |4 T/ w& h5 }3 W

, F' Z) ?. C$ u: R5 `if 4>5  4 is the fake one
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9 u6 v8 }) R7 C/ y  B$ Q. u' B/ P3 rand so on......................

hello1997

分3組4隻波子秤4 R+ {5 ^6 |& e6 W

" [( F7 i. v8 @! R& U* ^! |" ~& NGroup A: 1,2,3,4
% v& F4 P6 z2 p( t+ ZGroup B: 5,6,7,8+ C# \3 q& Y8 G( S8 {- z4 [
Group C: 9,10,11,12
1 B& t5 I9 M% Q+ e7 E# x/ hGroup D: 13
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) R' ~5 _9 b: n, x; ZRound 1
$ T3 e  G; y2 W+ Y! l' qGroup A vs Group B8 Z- f, |/ v6 Q; D; m" h
如A and B一樣, 即較輕一粒在Group C or D  @) U7 _5 G3 v! B
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Round 2
* c- ]5 A5 K3 t/ I3 F, G再在Group C拆成:2 e: k* v* H2 I! f8 i8 S; u
Group Ca: 9,10
9 r7 v; i7 F+ h3 m0 v  H  o/ [Group Cb: 11,12
- m# c9 r/ r# h& h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,
" b$ K% s& |4 H& i8 p# e要再秤, Round 3, 之後便知答案.$ A/ v  p9 k( Y( w
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e.g. #1 假設10為較輕的一粒/ a: H3 u9 W; h# d  g! \, x. n, B
Round 1( {0 q8 z/ v3 s4 u
1,2,3,4 vs 5,6,7,8 = equal) k2 C% z. X6 E
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Round 2
$ f$ I% `1 z2 A; C+ u9 [$ Q# Q9,10 vs 11,12 = 9,10 < 11,12
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$ n  D; t9 ?$ g, _3 G3 H2 E5 ~Round 3' ~9 _6 l% s; S) K- Q& ]. A
9 vs 10 = 9 > 10
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The answer is 10.
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5 F) f* ^' _4 O- we.g. #2 假設7為較輕的一粒
* e2 H4 I/ L- NRound 1
/ ?* z* }0 L5 H* O) \1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8) W- Q/ G# u5 F

6 I6 h6 v. R* l' A: J+ kRound 2
" V9 [* V8 W3 g; y7 ]5,6 vs 7,8 = 5,6 > 7,89 z: ]0 t+ P! `6 ]6 }' p% K
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Round 3
5 t4 ^# X: A5 J5 R  G  t7 vs 8 = 7 < 8+ Z! z" y) b& U) D* t- `; U4 f+ B

! O0 R, o( r- O/ U8 j) VThe answer is 7.0 N+ E  s- w8 n( r! q8 K. F
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e.g. #3 假設13為較輕的一粒
$ Q6 @# s- |, h0 Y# O& n, jRound 1
% v+ ?# c/ P' P. Z* m1,2,3,4 vs 5,6,7,8 = equal" P+ u. R: k, X0 ^( h+ e

+ W- H3 J0 o2 ^( b- Q' nRound 2
. l. I6 T) c4 ]5 R9,10 vs 11,12 = equal5 r7 B+ j! i& `; A6 N7 s, H- o
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No Round 3
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The answer is 13.1 L7 ?' S0 ?# p: v- p4 W% A  Z

3 f5 [: R& J  a8 r) i5 \- l2 S4 G, o唔知我答得正唔正確呢?! 2 z- f3 Z1 P  F5 W4 K& o

- v  N* r2 g4 j7 n& L[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:% {' q/ \) {" [+ o+ J
1.
7 H2 y/ p* Y5 W1-6 vs 7-129 H& l- \" Z" z
if 1-6 = 7-12     13 is fake9 z" S1 X0 c! b
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if not 0 z$ I- Z9 g* F+ o" y. q. ^! P

) \. L0 \0 a+ V6 n2 @' vWeight the 2 time 6 I& y; h0 {; `& c; i9 Q
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Suppose 1-6> 7-126 ?% T; ^: M1 A
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1-3 vs 4-6 2 [  e5 u4 |% `" x' l) u

1 w8 m4 R7 [# r0 WThen Weight the Third4 S2 I# r" ^5 h. L/ `: X
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Suppose 4-6 > 1-3
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* L  p5 p$ k' `, w. w  ~8 g5 EJust like the first Step1 r( b- s) P. Y% A
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4 vs 5
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) ]0 W# q7 S- b% d% e4 vif 4=5 6 is the fake one + h) S6 T* M1 f0 f1 T# b

7 W- ~# w6 C$ Eif 4>5  4 is the fake one
8 I* w0 P" R4 A! Wand so on......................

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問題第二步
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Weight 1:  1-6> 7-12) s$ _0 ~. l* J( y

! t3 J& I' q: s! H$ ~( ZWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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你第三步点去搵 7-12 边一粒???* I6 |% t  ~# x8 v2 X
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問題第三步
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0 O5 n. ?% Q* ]0 \" h4 ?; \Weight 1:  1-6> 7-12
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3 S2 Q% F1 u1 ^3 e3 [( k  J% Z& C/ uWeight 2:  4-6 > 1-3 % ]  @) Y9 Q. E  {# R' _0 k, q
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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