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)。4 m2 N3 k+ g- o  a( M
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: " d" j% j. G% i

' E+ h3 W* C* Q1. 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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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
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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:
. J6 L: L6 b/ @: 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,1 A4 N3 }. P$ r3 f" H
等我搵下仲在吾在" \& v  z1 e- |7 l4 B6 R7 F
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當日用左37分鐘答１２粒波子，差７分鐘才合格。* r# ]) ?) Y# {7 f4 k( D
13.........
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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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, y+ B  t# A1 ]) Q3 X3 [我以前畫左個chart去答,
0 y& w$ n" y; h: G, Z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:
  f7 Y6 V* A( ~" U2 A唔識隱藏...已經諗到..

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sor !!!....e加改左/ M$ b% S8 T7 U6 x0 w! [
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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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[ 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 {4 [, s" t3 K! l) y$ h
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.) y; Y; h5 J; V3 i6 j) g1 W2 p
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:0 x% d! b/ i) K: C
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5 V7 F4 q! H) _% Z6 q7 APlayPlay, Let me know later who has the right answer and I will add points accordingly.
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: F) K$ b% V# _4 ^1 ^Thanks

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0 T, v1 Q/ b. M不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
+ j  `2 Z/ Q8 r5 @1-6 vs 7-12
- b+ q* h) m1 q0 ^- i+ R& gif 1-6 = 7-12     13 is fake
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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 7 G' V! F- B( C' ~9 H# }

! J4 b8 J$ c; RThen Weight the Third9 t2 r! \5 G* a9 g
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Suppose 4-6 > 1-3
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. f# G+ \2 ^' a/ O8 yJust like the first Step5 E+ {/ r3 k4 F. u, Z  V

: S/ ], V) H* J; v0 e1 o2 R4 vs 5 4 [, P/ l2 s5 j1 v9 j, x8 B! x
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if 4=5 6 is the fake one ) U# f# h5 o; `
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if 4>5  4 is the fake one
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/ c' U7 {5 V# }5 n8 c; xand so on......................

hello1997

分3組4隻波子秤. `$ S: i( [3 F
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Group A: 1,2,3,4
+ T! v. m/ V" t( l, y1 y& y, JGroup B: 5,6,7,8
' X7 ]1 k! T8 l6 gGroup C: 9,10,11,12
0 {6 z1 x$ `, s* I4 dGroup D: 13
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6 I6 X) H* F$ j! zRound 1
  q, |2 U" N+ ]8 ^, N- ]1 `: L( ~Group A vs Group B
3 i/ X( \9 R  L! ]: D如A and B一樣, 即較輕一粒在Group C or D+ S0 U! j5 @) T) w: @# E

; h$ j+ ^- B  M! ^& y$ y: m6 w$ ^; jRound 2+ H8 N* _) Q1 J/ _$ B* m
再在Group C拆成:
4 r% J7 N, l* tGroup Ca: 9,10
  g% A# Q  G& ^6 J2 I9 |- ^Group Cb: 11,12
& u- `( }7 z9 ]: p; ^然後再秤, 如一樣, 即13為較輕一粒.
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% `- _& n7 t, \6 T+ J- p4 {- D如不同, 即較輕一組有一粒較輕波子在其中,
- V. s- F4 x3 Q( R: h, i& U3 W' G+ S要再秤, Round 3, 之後便知答案.
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1 Z; y+ C6 S. p) p; g4 W: {1 `e.g. #1 假設10為較輕的一粒
7 c8 \# A& U8 Z2 QRound 1
. `/ O; a; L/ M, y* v* Q* \1,2,3,4 vs 5,6,7,8 = equal* ~' [8 @( z* o* N. ~. j1 O0 A

6 N0 R- ?- P& ]) K: c* A" dRound 2
- p+ U+ W9 y# s4 w" T) R9,10 vs 11,12 = 9,10 < 11,12/ P) t" j" X- k( A% O

* Y* e. h2 I% G* h' ZRound 3
+ `, Q( X5 M# P9 vs 10 = 9 > 105 ]* A; E* S7 j
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The answer is 10.& t8 c" P( o/ L$ o- N
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e.g. #2 假設7為較輕的一粒
9 G4 U1 k3 k7 A# b! p+ N5 QRound 1% u2 Q7 M0 R7 ?9 ]; z0 B2 J
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
8 E% x" Q  e6 d( ^5,6 vs 7,8 = 5,6 > 7,88 t/ x8 n0 I' T6 E0 q' D
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Round 3
7 T6 V, f% M# M/ r8 y8 v3 p# T7 t7 vs 8 = 7 < 8$ A4 r4 \: A- O( @: j/ P5 D* y! P

$ B, X% ^: U* {# ~- EThe answer is 7.5 }5 a, r# ]5 l8 @/ s  D7 d
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e.g. #3 假設13為較輕的一粒6 A* U2 v7 j! S6 x% V5 C* m
Round 1
# B( d7 E# {* S! L6 e2 K1,2,3,4 vs 5,6,7,8 = equal/ \! N+ |7 ~; e; B3 {
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Round 29 Q6 w$ t$ k0 ~1 @  `
9,10 vs 11,12 = equal
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, B" Q8 U2 V) d1 q9 iNo Round 3
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/ ]/ ?  |* k2 U8 JThe answer is 13.
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唔知我答得正唔正確呢?!
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4 M' u( Y9 y' C5 i! z% Y8 M# t[ 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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% f% r2 i2 ]* }4 K1-6 vs 7-12
/ U8 X+ Y! T/ Fif 1-6 = 7-12     13 is fake3 k2 N' o( u" F& {/ k7 N1 p
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if not 9 ]7 E+ y, E: }" j" r# \) S
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Weight the 2 time
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. ^+ V2 m, c- qSuppose 1-6> 7-12
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+ _2 M# [, V. v$ `1-3 vs 4-6 / W5 U4 X9 B) L4 F
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Then Weight the Third
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Suppose 4-6 > 1-34 [# A& Q' a( d; T
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Just like the first Step
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4 vs 5
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, t1 l2 H1 p2 q+ T1 Bif 4=5 6 is the fake one % J3 g; I4 I1 Q" B! I

( `- I' g, l" Z( o: d- iif 4>5  4 is the fake one . j! x* e3 M, t& L# y3 M  G
and so on......................

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$ ?, U* r$ ?" C) E0 d問題第二步- C" Z: ?- H8 ?1 I9 e

* r6 g0 U! |- x. a9 AWeight 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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4 Z, W0 o) @$ ]- W0 |' y你第三步点去搵 7-12 边一粒???
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問題第三步
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8 p! f9 c' p( v; O2 jWeight 1:  1-6> 7-12  w5 T4 O: s# W/ N! Y/ p

& i0 V2 X! l/ [  nWeight 2:  4-6 > 1-3 * ?  Q5 f& D& v7 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