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; |: O' G" c1 u+ o" {7 e7 M

9 y/ H% P8 r$ p3 D7 B" {6 h: `『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)。8 ?0 G. }& a5 M
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？』) W1 @. Q" j% w. T) X$ p

' Z; l9 F5 S) ~, N- C* Z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
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# @* b. K7 ]. K$ I5 ^$ N2. 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+ T: B5 I& h# x3 n; o. o
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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:
, C% y4 _+ y/ f$ e0 W相信e條題目都有吾少人玩...

8 c3 i7 I5 z8 B2 i1 e) t我以前畫左個chart去答,* w, e8 y9 N8 ]' {" ^5 f
等我搵下仲在吾在& k- U; }' r' A% \) c

6 H" D! j+ t& h7 u6 C1 D當日用左37分鐘答１２粒波子，差７分鐘才合格。
8 W$ y  }0 M' ~6 X8 J+ s/ [1 R13.........5 d8 O' e/ k: u6 J2 m" s/ l9 g

! U  R7 J+ E* S( o* H/ B9 [/ t[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:9 N% w* R9 f5 ~9 n

+ J: L; d3 ~3 G6 T2 T6 D( b  ^我以前畫左個chart去答,: A$ |8 n+ I; D) v9 k
等我搵下...

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% V6 s: o3 S4 D$ N/ U& n! y; 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:5 s. C( V/ {9 |( N
唔識隱藏...已經諗到..

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* J) M( W9 d; R8 C- r  D' ]% Ysor !!!....e加改左
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1 v, k4 P) H" u+ g9 x" ^; j2. 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4 h8 G2 W9 @1 t$ N" Y9 e

+ `  u/ |7 V- S; E5 p[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:& [7 F$ y/ i# T3 D* F
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.$ d# x% Q3 }. d

8 S! r; R0 |0 l+ c9 S( _0 z+ S1 ^Thanks

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.3 b. C" w' M$ q" [$ t. G7 {1 T$ ]

# E3 @3 o; Q! ^2 O* F. _) }4 RThanks

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- \. Y# p3 A& t9 G5 c不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.* p7 C4 t; ?- L2 m' G2 b. X5 r
1-6 vs 7-12* f, U* T: u# ?7 A# E
if 1-6 = 7-12     13 is fake
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$ B& M  Z0 i9 i: P7 Kif not
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! J% `, E7 z6 b4 d/ rWeight the 2 time
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' T/ J% C$ H% v3 U# ySuppose 1-6> 7-12
: z3 X- ^1 X  z0 B9 h/ P) d+ X7 t/ B
1-3 vs 4-6
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$ C0 B2 p1 T! U3 v6 L" DThen Weight the Third
; V2 e" [+ i/ z/ ~3.8 |3 y% v# i/ j2 d/ Y& l" m
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Suppose 4-6 > 1-3
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Just like the first Step% ^* A$ {0 O$ d# A

" e' S' |6 @: e, ]1 c( F8 O5 y* ?4 vs 5 ! j. h: {4 d- w1 E) _0 ~

* F0 \+ w1 F& ]  ?& ?6 zif 4=5 6 is the fake one
* }4 N' R* a" A' t5 f8 n3 a; ~) v+ I2 a) y
if 4>5  4 is the fake one 1 d, K* ]; R+ n# Z. \2 ]8 i1 P/ k
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and so on......................

hello1997

分3組4隻波子秤
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4 `. V* s& r  i; Q3 j( A/ b& fGroup A: 1,2,3,47 l( L* m: x+ C0 E
Group B: 5,6,7,81 Z) ?5 Z5 ^6 a+ h: z
Group C: 9,10,11,12
/ |6 A+ i  ?6 H4 yGroup D: 13
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Round 14 |  K7 c; _5 U
Group A vs Group B
; u9 A; [- m" y$ e& ^如A and B一樣, 即較輕一粒在Group C or D
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Round 22 q" p* t+ V4 C( P
再在Group C拆成:) N3 C, r  L8 u) c4 i& J
Group Ca: 9,10& @" I+ L# L6 @. e) u+ C
Group Cb: 11,123 C8 f$ R6 Y+ t
然後再秤, 如一樣, 即13為較輕一粒.
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8 @/ R5 I" r, n, ^; K如不同, 即較輕一組有一粒較輕波子在其中,
; n8 I# P# \+ ?! N3 R" ?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0 `9 H# t" o- C' {  j) f
Round 11 \! K8 f$ A! q6 M3 ~
1,2,3,4 vs 5,6,7,8 = equal3 r: }- k: e0 J% w2 f9 g% r1 \* y

- m1 h$ P& [7 R5 C7 p- d$ DRound 2* h. _* U: J- Q0 S* E- }
9,10 vs 11,12 = 9,10 < 11,12: q0 B1 Q, M. i  \& Z: f( Y% |; D

+ U( S) N! R* M- e; E3 ~2 c7 O6 R/ eRound 3
* @! }# R5 p1 f) j" T1 \9 vs 10 = 9 > 10! d3 _0 M/ F4 U; m' ~( k: L% H1 d

/ ^7 t7 d0 Z; `! f. L2 u" z2 l7 hThe answer is 10.
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, e' g, K9 m% c+ _* T3 A6 S8 q+ qe.g. #2 假設7為較輕的一粒
: g- m% S: u$ R/ y& z/ HRound 1
- m  H3 Q( f" k: M! ^( e1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
; t/ w/ U6 q, x$ ]) V7 P# T5,6 vs 7,8 = 5,6 > 7,82 \+ ]) q& {1 G8 _. s) x

& {: q( |) _. S; J) ^, \4 c  ~Round 33 G8 e$ E/ v) A( o0 |# o7 R
7 vs 8 = 7 < 8
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The answer is 7.0 p; A! S6 Y. t) h
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e.g. #3 假設13為較輕的一粒2 J! h9 t! x* C- W" S
Round 1
4 o/ x2 B1 W6 g1,2,3,4 vs 5,6,7,8 = equal
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Round 2
9 M: M& o' E+ [1 }9,10 vs 11,12 = equal. T) k' v# v) G: t" u2 T& D# V
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No Round 3
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' b& z- s4 K$ b; @# M. |9 t/ W; zThe answer is 13.5 t& T- B! G- o
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唔知我答得正唔正確呢?! * o  O, i7 W. v# G
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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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. m* b2 E. Z: i1-6 vs 7-12$ h: n" \3 K" f( u' o
if 1-6 = 7-12     13 is fake8 ?/ s  O9 Y& }  W
- W! P& }8 _! D  O) q6 ]) S1 R
if not
3 d# t) w6 @  @# `+ x
. S' X/ I( g8 e3 B, jWeight the 2 time
/ n: `7 c9 Q1 F
. z% M7 c; g* ?! a, KSuppose 1-6> 7-128 T: z$ o" N6 _/ V/ t

- D, G& B5 A; X. R0 ]1-3 vs 4-6 ( X; t' [% Z2 e3 @( \4 J% q
( f* f/ O' P7 b' @
Then Weight the Third5 {2 v) }! o+ ?) z' c. @
3.4 F5 C8 Z8 t  v6 C3 O# D, I

. c# k) N" p( D- j, |Suppose 4-6 > 1-3
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, P) r7 \& U; ?1 ]( O  |Just like the first Step
- J4 S+ N, r# G3 x" [5 p
- U1 r$ E- L( d& i- B4 vs 5
/ Q- m7 d- z/ `5 v# a
$ V' r! u( a  cif 4=5 6 is the fake one " F! c1 I+ x7 E

+ c$ B- z# r$ }- E" Z* H& V" ]* Zif 4>5  4 is the fake one 2 t! o$ t4 H6 k
and so on......................

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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% _0 Y& S0 ]' w

, L  R9 Z, e  G你第三步点去搵 7-12 边一粒???
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9 c+ O4 D. k" l. B1 y========================================' k' P# g" m* Y. t( i4 k

, \9 z# G. T% S, \. i7 {5 P. ]問題第三步. [0 A+ @  _$ t& }8 j9 S" `: V- ]

# B! T8 }9 d( N+ R; B3 i9 bWeight 1:  1-6> 7-128 _! h$ {, r& b$ D+ h" Z, T# X
2 z  N5 @/ L+ q( O) F# T% {$ U5 T' T0 R
Weight 2:  4-6 > 1-3 7 q8 o5 w$ z9 P0 I' C

% U4 G, K$ C0 E, a+ f! X* 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