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9 p/ }$ ?2 z/ Q" e2 O/ ^4 m$ @, V
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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)。9 [  n: S0 g& A/ r2 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？』
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. C9 j: ^, d* P! E' Y! n( E8 r0 i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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9 M2 ^) C6 I& |- n& O3 U2. 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# c0 w. n6 ]7 k* ?

. s  A. a1 L/ n2 z. x4 n[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
+ Q1 G1 n5 A' y1 T  ^- q) F2 E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,
# m6 r- e! }" r! n" n: D等我搵下仲在吾在
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5 @! U2 e0 V) n) p6 G* t: g' v當日用左37分鐘答１２粒波子，差７分鐘才合格。) K" ?  i; ^& d# C; j
13.........
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( H, H8 B6 Y0 Y# Q5 T6 |8 P8 ?[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:" D1 ]8 h1 Y3 M

) Z! T( u8 _. _- C1 k我以前畫左個chart去答,
7 w( c" X5 D5 }. a0 W  S  \等我搵下...

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7 e, ]6 l1 P; J: }8 h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:: G4 i7 h0 T6 y# \$ S; V
唔識隱藏...已經諗到..

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sor !!!....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+ P6 \8 v$ D+ t( h

" H. X- Y# W2 N% W8 O[ 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 N+ M5 g* h# l- Z0 l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.7 O- y0 ?, C9 ?, k, a

7 y0 }' s* }6 N' ^& a( ?& F' GThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:3 X1 n+ s3 ?3 Y( F

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: l7 s' i/ Y# p, |7 E1 XPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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+ [: X' i+ e# V5 r& V, XThanks

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( ~2 Q# J1 i/ A4 g( V! g: j不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

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1-6 vs 7-12
: J! o) s* R- h- [  R& K9 zif 1-6 = 7-12     13 is fake. n, O% a- x7 ~* k" s

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Weight the 2 time & q( U+ k& b" o% z# j; f
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Suppose 1-6> 7-12
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1-3 vs 4-6 * l1 b: r  E: W5 ~

% `* ^& h! v5 ^/ ^Then Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step; h' d1 q2 I5 n, f
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4 vs 5
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7 i+ Y% R% S3 g# K" _: |/ }if 4=5 6 is the fake one
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if 4>5  4 is the fake one   E% p' n5 F! p9 w

8 N$ ^6 K: P8 w0 N. {; ]7 e& z2 I+ hand so on......................

hello1997

分3組4隻波子秤' d: e) z6 m- J: h4 m' o/ @
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Group A: 1,2,3,47 m4 x+ n  a$ M; w$ b( j  X
Group B: 5,6,7,80 R. T: F' M5 q" d
Group C: 9,10,11,123 |- V! ]7 }) K" C8 Y2 \
Group D: 13% d1 K3 c- t2 U3 S: S; H

, Z/ L( b2 B2 U9 F8 c% a6 nRound 1, f6 f& R) ?& `# M
Group A vs Group B
4 I  U8 S. N8 S# Q7 Q( m4 L8 u如A and B一樣, 即較輕一粒在Group C or D( C8 X! Z8 R  D, k

) [( j& {' J1 y0 O$ U+ u. [Round 2
1 D' ~$ Y; w  Z9 W* w再在Group C拆成:0 b! b% D* p6 S7 P; c( Y
Group Ca: 9,10
. X/ n; u. }+ ^& \0 {  A7 ~Group Cb: 11,12
+ L! U) o& r& d/ O5 C" T然後再秤, 如一樣, 即13為較輕一粒.7 v, m/ m1 k# B' Z: m' L! G
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如不同, 即較輕一組有一粒較輕波子在其中, # u( m: t5 _& o+ _; E4 ^
要再秤, Round 3, 之後便知答案./ }- D+ ]( q# \2 D% `
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e.g. #1 假設10為較輕的一粒  i8 q6 W- Q/ `7 f5 P8 y. M
Round 1$ D, @. L$ U! Q" O+ z/ A. W6 x% p
1,2,3,4 vs 5,6,7,8 = equal
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% p  T8 J1 v( G  KRound 2
0 e# |, V" m' k2 Q- f9,10 vs 11,12 = 9,10 < 11,12; b& S, f9 H' ~2 T& e. D5 f
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Round 33 X! H+ `6 e' P
9 vs 10 = 9 > 10
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  K) y! O4 k  p1 rThe answer is 10.
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  \) f( A- d8 Q3 H* ]$ Y. I: ze.g. #2 假設7為較輕的一粒8 M" q; C, K" a! b
Round 11 o& W/ M: P, q+ p% q5 z
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
( w$ q$ e( o8 I9 {3 Z  c5,6 vs 7,8 = 5,6 > 7,8+ C# L+ U* I$ c0 c7 S( Z" R
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Round 3
4 B* R; l. k1 \8 l7 vs 8 = 7 < 86 G3 {& w" x2 R4 d
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The answer is 7.3 [0 I& R+ |9 L. a& B4 H
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e.g. #3 假設13為較輕的一粒* `$ Z+ o, S! h1 D) T7 U8 W
Round 18 e' U4 K0 k/ O4 G' ?
1,2,3,4 vs 5,6,7,8 = equal8 L3 o+ e) V0 \; }
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Round 2
' K* n* R: U8 {8 z: s4 O1 F9,10 vs 11,12 = equal
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No Round 31 S! n% Y. x6 L: v. R4 I

' ?7 v% w! E6 _9 H  OThe answer is 13.
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. F7 W0 K; _2 i. m0 \+ {6 T唔知我答得正唔正確呢?!
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; W6 @4 E& a( e5 \" |. [[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:+ v# e  b& {$ M/ U
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1-6 vs 7-126 S6 h0 R7 A: B) V* {. t0 |5 z  z
if 1-6 = 7-12     13 is fake
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Weight the 2 time + B3 [4 Z/ {' Z! A# k8 N$ b

; c8 Q: {7 q# z' kSuppose 1-6> 7-12, l# F  `6 x! l) Q9 M
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1-3 vs 4-6 & y: D1 G+ j" K, U  x1 j
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Then Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step2 ]2 B; J  }6 }' p* K, V0 u
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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 2 `4 Q# }! H7 F  v$ z% n7 M
and so on......................

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問題第二步. \/ j5 K3 m$ |1 L/ c. K% C
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Weight 1:  1-6> 7-12/ e7 l+ q; y+ C. i0 @8 p

5 k# W2 ?7 I7 h/ g% }Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6  H& \9 x; {( `. F, O

& n$ E# l5 x1 O; O你第三步点去搵 7-12 边一粒???
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+ U7 l7 |( c5 G3 E- f; v& X========================================
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問題第三步
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Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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% `3 J) G. j, B8 W6 b1 P! [5 x5 n( [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