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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, A4 n. v- d* o4 \- t6 G+ @! \0 v『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)。; f6 l6 a. [% T& r( c6 _3 P
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？』! v" l& _3 z: f9 d  R
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注意: ' i( Q9 W- I9 g% O

) a3 K+ Q; w7 A+ O( O1. 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3 n2 |; p5 o8 F, o' o  E+ Y$ S2 v

2 @  j) h7 s9 i5 Q' U6 O% T% H9 h2. 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) {3 N0 u" O$ x. ?8 T( O. c
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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:
8 F6 U& |+ j2 A相信e條題目都有吾少人玩...

, Z. B" i' Q1 a我以前畫左個chart去答,# g) ?& K- V' y6 e7 W
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。8 c$ N- w  p: L: e) U# \2 c" b5 [6 y
13.........6 P1 O$ \7 H) D- \! y! o9 c( l
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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:& J5 l+ J. L- n1 j  l

( W8 ~# W# H- |% r, k我以前畫左個chart去答,4 V0 s( g; m0 W6 h
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:  h: a3 U0 _9 o% X- N
唔識隱藏...已經諗到..

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' Q* h/ L0 X" p3 G5 A" bsor !!!....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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3 j/ D2 A* k0 `7 B! g/ l8 v/ h( {[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:! a. W5 C: e6 ]3 J6 Y
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." v: z. Y! V* B6 f6 q9 o/ o" S
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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.- E, v" Z2 B7 X2 P
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Thanks

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& e8 ?$ h" u- d4 L  q" |& R" l不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
8 Z. D# \" x6 n2 B) ]1-6 vs 7-12
. w! j# I+ ]9 _$ O6 dif 1-6 = 7-12     13 is fake8 S6 P6 F0 V- v& u: Y) U) ]% n
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Weight the 2 time
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Suppose 1-6> 7-12
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1-3 vs 4-6 9 [# B5 e+ y1 _+ V6 x* G

' x* f2 E+ ~% ?0 t, Z, LThen Weight the Third
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Suppose 4-6 > 1-3% @3 o, d: c$ A, j% m$ }8 H
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Just like the first Step/ N* @: {4 W( V2 X
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4 vs 5
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( a/ ]/ ?8 x0 ]' gif 4=5 6 is the fake one
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if 4>5  4 is the fake one ( g& I- \/ a" H' b

* Q# B) `, o: ^7 `' gand so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4" }: m" _$ [  P7 m: \% u& ~
Group B: 5,6,7,8
6 @4 ~% f5 |) K7 Y" ?/ Q6 }& dGroup C: 9,10,11,12: I7 c) S& Z( l7 d5 {
Group D: 13
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Round 1
0 j% o  s* e0 Q5 Z2 r$ u" jGroup A vs Group B
  s) g& G% ^4 ~! C如A and B一樣, 即較輕一粒在Group C or D  {/ _" J3 R- d4 s2 t$ q
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Round 21 C5 l; S: }/ B1 [/ R  e
再在Group C拆成:
# m8 |- k" h: R. x1 G# o2 Y/ RGroup Ca: 9,10% \! @. a! E. l" L0 o: A# Z( y/ S8 j) @
Group Cb: 11,12
! ?' ]8 M2 C2 f0 m( ?然後再秤, 如一樣, 即13為較輕一粒.; X. L* d0 r& \
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如不同, 即較輕一組有一粒較輕波子在其中, . K  Y; ~5 k0 M( c5 I  t* N
要再秤, Round 3, 之後便知答案.* \% B& i4 U1 @9 F% R
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e.g. #1 假設10為較輕的一粒8 E2 C7 g) b6 i. |& x# r: ^
Round 12 u1 w. Y$ v/ W' z% K8 P
1,2,3,4 vs 5,6,7,8 = equal( ^9 g1 Z. ~# n1 I; C0 j
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Round 2
- n; z4 S: M9 P. a! u9 b6 D0 N) Y9,10 vs 11,12 = 9,10 < 11,12
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Round 38 t9 Y2 M/ C' _" j* _$ u
9 vs 10 = 9 > 10, A4 z5 Q/ w# Z; S4 c) N9 a
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The answer is 10.; K7 q; H% a# S' e( f  x
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e.g. #2 假設7為較輕的一粒1 @7 n$ W6 _0 m% {
Round 1
2 _6 K+ F7 i- W4 m/ g5 w) W% t) L1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8& {! B5 W+ q: y2 N6 K# c- s
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Round 24 j# c! G1 M, x3 g& ~
5,6 vs 7,8 = 5,6 > 7,8
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* M# R, f4 R& v5 I" Y$ YRound 3
$ D' M" l. w7 w( W: I+ Y+ W7 vs 8 = 7 < 8
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The answer is 7.
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" I2 c4 n! v+ @7 @# @e.g. #3 假設13為較輕的一粒5 x2 w# t& Y" ~% H, S
Round 1
+ M+ U- ~& Y5 a1 A1,2,3,4 vs 5,6,7,8 = equal
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0 ?5 ^0 F' d: N6 h# ]% t$ PRound 2. ^0 z* L1 U- ~& S/ Q
9,10 vs 11,12 = equal4 R* n- R* t3 B2 V2 s

0 p: ^" R/ w0 g7 `3 ]+ m" P" ~& V; ^No Round 3
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The answer is 13.9 }8 Q; q$ r+ a
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唔知我答得正唔正確呢?!
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# o# y9 C; {3 f. ~  e* K) \/ x[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:8 B1 {" z- [$ _4 K$ C
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1-6 vs 7-12) Z2 _% H. S; M7 W
if 1-6 = 7-12     13 is fake
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Weight the 2 time
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Suppose 1-6> 7-12) ^( x7 S0 U  U
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1-3 vs 4-6 ! d7 d# G" y. A7 P2 }, `
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Then Weight the Third
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Suppose 4-6 > 1-3
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' \& G9 N( b8 b! BJust like the first Step
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4 vs 5 & D/ i1 [* A* p
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if 4=5 6 is the fake one $ }7 T. B8 m- h' c
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if 4>5  4 is the fake one . D3 E& Z, Z! J
and so on......................

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8 v. |0 H; u! j8 z問題第二步
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* ]$ D0 P. x+ ^7 Z% F0 B2 BWeight 1:  1-6> 7-12
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Weight 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???, g4 f% h, b' F  Y% g6 F  c% y( ]
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========================================5 h# r# a8 X- q) S
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問題第三步# Y) _- Y! s: m' e. V5 d8 {
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Weight 1:  1-6> 7-12+ z8 _0 F" k9 x2 G9 w
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Weight 2:  4-6 > 1-3
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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