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6 B! K: m7 |( r
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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)。2 \2 O6 d# r5 K
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？』! S5 ~, m$ f9 S4 z$ I9 J3 O
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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
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" r& ]; ^+ Z$ e7 W$ Z4 y3 n2 H& j8 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  s$ K- _/ d" z/ E7 V, s
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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:
& `! y1 i3 Q8 @) _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,+ g- x4 F! ?, d* v2 U: i
等我搵下仲在吾在
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6 g$ b5 Z  Q. y3 ?當日用左37分鐘答１２粒波子，差７分鐘才合格。
7 l5 y' q  V9 I13.........
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% I) }, g  H3 |. B4 h' q. G[ 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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- n; R" i$ S: a, Q我以前畫左個chart去答,3 ]4 B: X  k$ g
等我搵下...

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6 C! E% o( q" M' O, B; [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:* Z1 U7 y" @& j8 J1 P* R# a+ G1 n1 G
唔識隱藏...已經諗到..

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% ~8 v. ^6 C7 l, V, Dsor !!!....e加改左! @; S$ A( G( ]

* g% D2 c8 N% |1 }8 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# j# g9 d4 A4 E  H/ U/ T
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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:
2 _/ j" E0 Y' M+ i3 i7 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./ v0 n; K# Q1 S

& v* [1 i) F( e" Z- k! |" y7 QThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:6 S( C6 y* ~$ F! k0 N9 [- x

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

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不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
" `; Q' z% }2 j1-6 vs 7-12$ o1 m, o3 D. t, H; @+ A2 v
if 1-6 = 7-12     13 is fake
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Weight the 2 time $ ~: S/ x. V2 J  E7 ]9 @+ V

" m/ t% O# K  d* k" y  b" RSuppose 1-6> 7-12" P4 w5 {. k% w% e5 E

: ^- Q' [) h. t. [9 g1-3 vs 4-6
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Then Weight the Third
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" i/ B& q4 s, W! g- nSuppose 4-6 > 1-3' o% S5 j) @' m4 H7 o
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Just like the first Step
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4 vs 5 # c, g) U- L0 v- Z
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if 4=5 6 is the fake one
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6 [0 I# B! ^2 @- D8 l: k2 K1 Yif 4>5  4 is the fake one $ {5 P3 _! D- E) {6 M/ G$ Y
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and so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4
" U2 j- i. ]3 V3 U( W+ Z1 p7 ]Group B: 5,6,7,8
( d7 ~( @9 \) I7 [, TGroup C: 9,10,11,127 x! M5 w) l6 V4 _
Group D: 13
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Round 1
! F: r; v$ p$ }. m4 hGroup A vs Group B/ Z0 c  h) d$ G) w# F  f1 l
如A and B一樣, 即較輕一粒在Group C or D0 b0 i8 ^% f) F6 ?0 s, ~

$ L. [3 G9 K1 B/ O) J3 ^Round 20 l6 I3 M" n; f! ]% c% o
再在Group C拆成:8 _! u5 h, Q+ G  m' |: \- e
Group Ca: 9,10
% P! H, f* P0 d! i5 H# ~: u* z# I( k1 tGroup Cb: 11,12
& D: t2 Q% f0 w0 t6 F' b2 B) _; L+ |然後再秤, 如一樣, 即13為較輕一粒.
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1 h4 x  s: M# |, o0 @如不同, 即較輕一組有一粒較輕波子在其中, 4 K5 T4 U9 Y0 f
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* L6 f8 P: c' w" E
Round 1
) V7 t9 w8 m7 _/ |1,2,3,4 vs 5,6,7,8 = equal9 a9 |8 n! U7 t6 F& n4 c
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Round 2) x$ c. E& B/ Q1 A7 ^, ]- F
9,10 vs 11,12 = 9,10 < 11,12
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Round 3. t0 W9 C* C3 z) ^& C3 q% ^: H$ h* }
9 vs 10 = 9 > 10
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The answer is 10.
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9 y& `/ ]9 Z6 \: p: Le.g. #2 假設7為較輕的一粒* X, W) [" |( D! q2 E8 q; z
Round 1
0 a# X5 K( @! d1 G8 z; z1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8/ ^1 O& k+ |# K9 L& Y% R/ I
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Round 2
* t0 s% Y1 a- S9 Q: o  `5,6 vs 7,8 = 5,6 > 7,8
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! {! X, n) n9 D) {% d  J6 P: \/ ^Round 34 b  e; L0 h* v1 [+ t. i/ o$ ~
7 vs 8 = 7 < 8
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The answer is 7.: p! v: i8 U+ ^+ w9 ~8 R; I+ |8 H

" x! l& M8 o, [5 Ye.g. #3 假設13為較輕的一粒7 c+ K  g2 i" g* A  ]1 ?
Round 1$ v5 S$ F+ G4 S0 h) q- I
1,2,3,4 vs 5,6,7,8 = equal7 |5 g% b: @6 A( _$ H1 f8 v
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Round 2( f2 |3 P  R/ y6 i+ N
9,10 vs 11,12 = equal; ~1 N. V, p/ g, N. Y

- x5 S) P0 ?( B2 e$ w1 g& PNo Round 3$ H, A& G0 X9 F) f; T

# d9 D6 I9 g7 E2 q0 X  zThe answer is 13.
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唔知我答得正唔正確呢?!
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% ]5 {' T4 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:
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1-6 vs 7-12
! H9 s7 o& t' N/ P: ^if 1-6 = 7-12     13 is fake
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if not 4 v$ [2 b. E" d" ^
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Weight the 2 time ' z& S4 H% {& U

' z& v4 I8 E) OSuppose 1-6> 7-12) b& o- c: g) t# W

+ R5 D. h4 [! b, r' S! H9 d1-3 vs 4-6
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Then Weight the Third3 I2 z4 v) M+ {6 S0 ~0 f! }# P) o
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Suppose 4-6 > 1-3
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Just like the first Step
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4 vs 5
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if 4=5 6 is the fake one
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if 4>5  4 is the fake one
. Q* ~4 R1 l8 oand so on......................

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問題第二步
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Weight 1:  1-6> 7-12$ ?7 Q- E3 k! @9 y4 e; ]5 A0 m/ S
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-65 P& J1 l# q( a9 [

+ k1 s6 |$ |, a9 W你第三步点去搵 7-12 边一粒???7 x7 P4 ^% n) C& e. l% `1 O
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# p8 X4 ?2 I7 l  z& g$ b. l問題第三步
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1 a- C  k2 `6 F- ]Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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9 m8 N" }8 j- r4 R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