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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『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)。( h' X1 E% @1 Z( d/ l" o
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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注意: ( m! Z0 u. P- h8 L* H$ U

2 f: |' H! d4 X* Q$ `4 _5 ?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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) ]% [/ U+ c* \& N* c, B- ]8 C% ]4 I2. 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
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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 21:34:7 V' Y" |1 d  G) f8 k
相信e條題目都有吾少人玩...

# x# K( p5 U  n3 c. U# C我以前畫左個chart去答,
6 p7 q: @5 |$ m. |" y9 j3 s等我搵下仲在吾在
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' Q8 j6 p4 w* }5 P1 h2 w5 I& {當日用左37分鐘答１２粒波子，差７分鐘才合格。
+ f* U3 Q4 \% `( l/ L" W& d& N9 j13.........4 d) h2 ?3 R* S* u" @7 O! \9 j

' F, p" R- }# b( k7 V3 U$ V) R3 M[ 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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: A, B( C+ q9 {0 T$ N: n! z我以前畫左個chart去答,
# p$ A+ i% H& i% M  G% C& L) J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:9 I- m1 d( C+ G/ F5 ~1 G8 U& I1 [
唔識隱藏...已經諗到..

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6 M1 `4 b7 T4 z" f4 r9 v/ h2 Psor !!!....e加改左) n. }: D( `/ M; D6 |( i

0 q3 }0 y- g$ y1 |( g* r! q/ r! e2. 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7 y/ V# T9 P2 w7 X; E
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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:' m% w- b4 O4 y/ C  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.
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+ c2 B/ y, |: z* ~% JThanks

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.
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5 t# |4 s9 Q. YThanks

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6 `% ^! \) a  Z' @1 M# B0 F3 N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 7-122 Y9 l0 s1 |. m- R8 m) @+ l
if 1-6 = 7-12     13 is fake
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if not
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Weight the 2 time
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Suppose 1-6> 7-121 E7 s0 I/ W( n5 V/ ]

* S2 E" }  T) Q( s* V) S1-3 vs 4-6 + R9 h# v! N% Z( H. [: }

' {) H6 l% v/ T: _& [, }$ y8 oThen Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step9 k/ N4 Z* K8 L3 \
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4 vs 5
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! R* u# o, d  ?6 U( z6 \1 Sif 4=5 6 is the fake one
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& R; q) C* p. K6 N# T+ F3 G8 Eif 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤: Z& \+ P/ W* s! n$ N

7 [; M1 A3 R9 y/ r7 gGroup A: 1,2,3,4
6 @8 ~  y4 n2 a9 [* Z8 b3 oGroup B: 5,6,7,8" f7 W9 u! Z$ s  H
Group C: 9,10,11,121 U$ n. b8 D8 w5 t6 P9 m# s, u" ]
Group D: 13! ?2 W$ r  P7 d( Z2 x; e
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Round 1# ?  Z4 O/ r( n" I6 h4 m" {
Group A vs Group B
0 T- W- u5 u  C4 `; M( |* p" V* m如A and B一樣, 即較輕一粒在Group C or D3 ~3 L9 d& n' B+ W

) W" j( d0 W& L% [9 @Round 22 _! ~1 J- r4 H
再在Group C拆成:
1 t# }. |  ?" ]8 Y, t! w+ oGroup Ca: 9,10
. Y; ~2 @- w5 t8 b4 {" K6 J. {" ^Group Cb: 11,12
% `4 E  j5 b: ^5 `; }8 q% m) E然後再秤, 如一樣, 即13為較輕一粒.3 |# J. ]3 W/ b' P$ Y

2 p! v" F9 {, g' G如不同, 即較輕一組有一粒較輕波子在其中, 1 j; c8 b# D; L5 u2 ?( m
要再秤, Round 3, 之後便知答案.
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" u$ A  m5 q# U( P1 Ie.g. #1 假設10為較輕的一粒
  o( T# f( Y: k; R8 IRound 12 l3 R! I$ C+ I# n( s( F
1,2,3,4 vs 5,6,7,8 = equal
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: i' Q0 [+ n6 F2 kRound 2$ M- ^" p7 J. r- a7 j
9,10 vs 11,12 = 9,10 < 11,12
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6 Z9 p" u4 e! a0 U! r' H7 S) B4 |" l* S5 hRound 3
4 C$ A: x" i$ \$ S9 vs 10 = 9 > 108 v1 k0 f. Y: W) x

6 m6 a0 c# u9 e+ a5 p: ?The answer is 10.
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e.g. #2 假設7為較輕的一粒
" |! Q8 r; q/ c0 y8 `Round 14 m7 C- Z+ T0 B4 {, Q7 h* ]
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8; Z1 N4 J) d! @8 x6 n9 R6 i% j
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Round 2
! n6 B. y, a2 s; i8 g! z" X0 N2 d5,6 vs 7,8 = 5,6 > 7,8
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- M- z* i  Q7 @5 i: kRound 3
5 s0 t7 N1 s7 A" n& d- E7 vs 8 = 7 < 8
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The answer is 7.
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e.g. #3 假設13為較輕的一粒
# d% s2 K" F* V" R' S! D/ F: URound 1
, r6 Q8 M) {& s; L) R8 d  e4 E1,2,3,4 vs 5,6,7,8 = equal
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Round 2
. j- ^' z1 J" p5 F8 H4 Y- |9 e9,10 vs 11,12 = equal' F! f4 e- n1 o5 B) [, t: E
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No Round 39 E; n/ D# ]7 P# L- F
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The answer is 13., X3 R& n' D, A( D

: g5 K* S: G2 n" d# D3 d唔知我答得正唔正確呢?!
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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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/ h! W0 Z2 H9 S' j1-6 vs 7-12! w  U9 ^0 N. Y
if 1-6 = 7-12     13 is fake
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if not
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: v1 v; m8 {! Q6 t3 y$ ^Weight the 2 time
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" K* _, f$ z" ~1 I0 U! wSuppose 1-6> 7-12
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1-3 vs 4-6 6 E8 b8 F0 v' T: Y0 Q8 c+ C3 M

6 Q* w$ N- u# b0 xThen Weight the Third
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Suppose 4-6 > 1-3' I# y8 X8 p6 B" N
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Just like the first Step
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6 ^' V* P& a* E! x4 vs 5
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# ^9 [& |4 ~" J% o2 Cif 4=5 6 is the fake one , C1 r9 ?& f7 W; _

  \% ~* W$ Z5 kif 4>5  4 is the fake one - l. M: H( G* M  b: m' E6 }
and so on......................

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問題第二步- G6 m6 v/ A% T( L% L! r2 e* e' L

- Q* F! [8 z. Y7 w1 LWeight 1:  1-6> 7-121 }9 i% U+ Y8 k$ c( Z5 u$ u
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6- J6 i6 P2 l6 C7 P( i! l3 K0 Q

" y, V$ a, n( t, x  D5 ~, n你第三步点去搵 7-12 边一粒???) A) G2 H/ z6 K9 N9 `

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問題第三步: U& e9 g+ A0 c8 X: D$ R
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Weight 1:  1-6> 7-12) n4 u& B% Q  q6 G
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Weight 2:  4-6 > 1-3 - D/ p* s1 t( @- z2 H, J+ E
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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