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5 u" d1 h( `. G) q* G/ e* Z: R5 v6 H

( g  S# D2 v0 m( B0 [『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)。
4 D8 ^; j- g$ T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？』, ~- L# n$ S( V+ I
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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/ }- R2 [; q9 W; F& \
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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8 W- f# [. M1 Y7 f3 c' g

, ^9 V/ c0 l% q3 q: V% ^& |[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:& S6 L- A- U1 V- j2 a
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,% I7 \0 [3 z  Q5 ~/ k: C# C
等我搵下仲在吾在
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# f3 W& `9 o# ^- l. u當日用左37分鐘答１２粒波子，差７分鐘才合格。
1 j0 k2 _+ n, d" l13.........
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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 }2 n6 s' ]- |: g. x( _/ {/ g
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+ w% W* g  M0 D. ~) R+ o唔識隱藏...已經諗到..

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sor !!!....e加改左
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+ [# L1 j; \5 c8 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( Y9 @. c/ f8 d
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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:8 W) f2 G$ L- s* d2 e
相信e條題目都有吾少人玩...

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) i4 Y& l* @6 {4 N" [9 e4 q+ U* kPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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: ~: A: s+ j6 A) I6 ^/ |0 B. ^Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:6 X4 e4 _2 B+ G. L9 n- d5 E9 y
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* w" V8 g" E" ?1 P) B  IPlayPlay, Let me know later who has the right answer and I will add points accordingly.6 e; T$ n5 @! s$ y
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Thanks

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* B6 l$ M: w% I5 z# w不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
. T# r! y, k+ p: A. j2 N0 e1-6 vs 7-129 l1 j1 ^4 p2 \3 r  ^1 B% S7 r  i
if 1-6 = 7-12     13 is fake
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& n7 I( S3 R( }9 Q) Y7 Yif not
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Weight the 2 time
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  H% ~  n" J  o8 h- l- ?4 bSuppose 1-6> 7-12
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; J. N( `& s% k- h1-3 vs 4-6
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Then Weight the Third
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! l% [2 G4 g1 \8 BSuppose 4-6 > 1-30 [' o% b4 S  y5 d; j
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Just like the first Step  F6 s9 w, a5 |" n

, ]  n- P0 k/ D8 _) H; a; _4 vs 5
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2 X$ D6 K; b4 N5 ^* b6 sif 4=5 6 is the fake one . b: M9 M; N- ^

4 v. v+ {8 |$ A- O1 e# }4 c1 Q8 B+ C) gif 4>5  4 is the fake one 4 ~+ P- {$ ?1 u* i
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and so on......................

hello1997

分3組4隻波子秤  |5 L  z; j, Y9 I3 @

- W# I0 A& P. O( d7 W& B6 K) mGroup A: 1,2,3,4
# ?4 E6 a2 d1 KGroup B: 5,6,7,8' t8 d0 s# l& _# M& O
Group C: 9,10,11,12
1 q5 v6 W: a" d! ?" F9 \$ N* _% j+ }Group D: 13
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; R( s3 c# h; _, ], P$ V7 TRound 1
3 D) k. V* Z! u3 i, i  bGroup A vs Group B
0 `: d0 L3 ?1 f* b% a) }如A and B一樣, 即較輕一粒在Group C or D! o1 k& i3 s8 |5 p3 h4 H1 Q( Z2 K! b8 o

5 g5 y( r. w; f) i' N% rRound 2
3 x) `4 P% M7 N3 P5 K, K再在Group C拆成:- B1 ~) F" P2 U. e6 _
Group Ca: 9,10
$ {+ C5 t! ~8 K  FGroup Cb: 11,12
! @8 Q2 ^3 T, }" a8 m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,
/ Z4 h' U, X2 @7 R9 Q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2 b' U  q/ F- L6 c5 N
Round 1
0 I& Y+ Z3 v" a. B7 o4 X" |8 T1,2,3,4 vs 5,6,7,8 = equal
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Round 2
3 A! N4 u6 s+ X: y: _5 @; l4 I5 B9,10 vs 11,12 = 9,10 < 11,12
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Round 30 x8 Z! ?: T$ k" F! O
9 vs 10 = 9 > 10, r* F7 [! ~, @& U9 i! i) t, H

! L# o3 z, }+ YThe answer is 10.
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e.g. #2 假設7為較輕的一粒2 @5 x" _/ j6 `; W. I
Round 11 a( v$ l, \5 u- k3 b1 c' y
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8" ~. O  q& I0 u
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Round 26 T2 h! M3 v. e2 L( ]+ o! h
5,6 vs 7,8 = 5,6 > 7,8
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1 I8 X2 W+ l1 h+ DRound 3
; K# w& L& J- U- r$ r2 |7 vs 8 = 7 < 8
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The answer is 7.' _2 _) Q6 \' ?: f0 e. U! W+ o! ]

% y+ x- I7 d* K" x( v9 s' o9 ^0 Xe.g. #3 假設13為較輕的一粒
1 c% k, g0 k3 {5 |, @Round 1
* k! E# \8 a' r# m$ z1 Q( C) J1,2,3,4 vs 5,6,7,8 = equal! F/ I2 k  V0 ~1 v+ @
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Round 2
: T0 A* M# m- @# J% ^- R2 ]3 U9,10 vs 11,12 = equal
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No Round 3* ]: @) z9 e$ Q8 V& A& P7 y7 _2 E7 l

: Z. q* F. t- y" \The answer is 13.
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唔知我答得正唔正確呢?!
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" r4 u2 y- Q% I, n. U[ 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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7 r9 K9 i+ J6 @0 P1 ~% {1-6 vs 7-12
5 _# r2 o* v; ]% X* Eif 1-6 = 7-12     13 is fake
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if not 8 ?+ r) r9 ]4 O% ]

* L; ?) p5 c% Y1 A8 HWeight the 2 time
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" c) V1 j9 l$ J9 K  }Suppose 1-6> 7-12
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1-3 vs 4-6
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  s* z4 T3 O9 F/ h, z1 OThen Weight the Third
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Suppose 4-6 > 1-3& ^7 W7 u1 M, j, L% p/ p9 F- R$ I
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Just like the first Step& @6 Y9 X6 N8 B- Q7 M, l; V
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4 vs 5 6 E+ [# f3 l: L- V7 b

, U, r1 K6 a! k/ \* Qif 4=5 6 is the fake one
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* }) y) `, N# C  \if 4>5  4 is the fake one
1 Y' A9 h2 l- c! U& X8 J+ l5 }: mand so on......................

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# z. F7 c# [8 O* W3 J- b問題第二步( w9 t7 e7 \: Y$ O' F

) _5 w+ v7 p1 w4 a7 ^Weight 1:  1-6> 7-12; ~/ F" L2 h- e# g
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-65 s) ?2 y* `) o4 h. ]& X" A
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你第三步点去搵 7-12 边一粒???1 F% U5 I) V, W0 F
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========================================
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$ {( d6 ^! i. q5 R8 ]1 K+ B問題第三步
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Weight 1:  1-6> 7-12
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7 P# d6 C# ~" w, eWeight 2:  4-6 > 1-3 * i6 u' e" m; a: I, P: g: i1 Y# ^; 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