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, v+ r  f5 e6 u$ C4 P

8 S& j# ~% I/ o  E/ T『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)。, P) K* Z- N! s' M2 W1 B
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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( M: |( X8 f: B- t注意: 3 x) B' q0 J3 S4 c/ i

4 \( W0 i, C0 b4 p1. 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( L! R9 G: |% [3 w4 z
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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 21:34:0 B1 x4 J& p4 z$ t' f0 n* j0 U
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,
5 _6 I+ E- A: ]; U0 x9 e, }5 I等我搵下仲在吾在4 ~) R  r& U- ~3 z1 N" Y$ A7 m: }
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當日用左37分鐘答１２粒波子，差７分鐘才合格。- S; t: G6 I$ J' m0 k2 J
13........./ Z% W2 f7 E- U7 f8 ^* [8 T

" E) J+ e. `" R( K+ Q[ 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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% G' q" C. r$ P) Y我以前畫左個chart去答,& W4 B7 U) R3 I2 O
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:
  N/ W" o8 [: C0 z' n% g唔識隱藏...已經諗到..

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sor !!!....e加改左1 p  M! W9 ]. b) E
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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 c/ M- F3 ]2 e  w7 `- b. J
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- m& |) g" c) z% T6 I! }  S6 z' l" y
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:& S! B7 m( n1 {. D% \

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% E5 N$ t9 z) g, d% j0 i' J& DPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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! H) i/ H4 V% hThanks

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) R7 ?4 l) i: r, n+ d/ z% K8 i不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
, J# h2 y- L: m1-6 vs 7-12' [+ {7 i$ {" @, P; x; G7 F
if 1-6 = 7-12     13 is fake8 l# E+ [5 k5 g$ S0 w5 E5 O. Z5 ?
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if not
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Weight the 2 time 8 j" m/ S4 V* C
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Suppose 1-6> 7-12
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1-3 vs 4-6 - |& m3 k. Q0 n% N  {1 m

* p" ^/ W: u) Y, z* a/ T% `- H) CThen Weight the Third
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; t$ Q% v& U( n% b: x+ BSuppose 4-6 > 1-3
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Just like the first Step
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6 v- y" V* Y) G9 {8 u9 n4 vs 5 : A, f# H! z& b# }# v' c

, r4 _/ c$ N  Vif 4=5 6 is the fake one
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if 4>5  4 is the fake one
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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# h# k- ?5 v! L7 t! C2 c# l
Group B: 5,6,7,8
" X4 I% x: Q7 R$ QGroup C: 9,10,11,12
2 g2 A: X4 D1 c# R4 ~Group D: 13
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Round 1' s" l/ r! a/ f% e! G9 G
Group A vs Group B
1 U' l' ]" f- |1 G2 F7 M4 |如A and B一樣, 即較輕一粒在Group C or D5 Z. I9 @4 Q; s' ?5 ^3 j- S
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Round 2
3 K1 }+ ^# O; n  ?$ k. z' c再在Group C拆成:7 {! S/ R# d4 z. |, n
Group Ca: 9,10
" J3 ~* X+ ~3 `9 pGroup Cb: 11,12
- m. Z4 w1 u2 s然後再秤, 如一樣, 即13為較輕一粒.$ p- S$ `) n2 I* r

8 b% T; c2 O( P) }: f9 W7 t如不同, 即較輕一組有一粒較輕波子在其中,
( Y2 E( T7 R% ]2 Y' F  `, ~要再秤, Round 3, 之後便知答案./ n2 B; g" [6 W( O6 t- Q) }) t
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e.g. #1 假設10為較輕的一粒
1 R2 z3 c, b" L9 eRound 1" u2 s' d/ a: Q/ |7 c
1,2,3,4 vs 5,6,7,8 = equal: o) R9 j! c- I. p. B3 I" s% k
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Round 2
7 k% w' ~" ~9 g+ t. G9,10 vs 11,12 = 9,10 < 11,126 w- i, D1 N. ~4 N5 t0 s1 V; m

! p' m- ~) I$ @: v4 @Round 3
; G6 U0 J. P, H7 D% z0 V9 vs 10 = 9 > 102 U) P- K% [( E0 L6 }/ t2 k3 O

( a( s' p8 k% h/ H6 `The answer is 10.
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e.g. #2 假設7為較輕的一粒8 ?( Y+ F! U" U) ~0 C$ d
Round 15 U( `" R) q8 X4 C# V9 i# q
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,83 z$ Y, y# L, d; i7 A+ g& a
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Round 24 t2 N" w' ?) g( q; p/ |, V
5,6 vs 7,8 = 5,6 > 7,8
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2 d. y4 s: s/ e! ]+ O) ~5 `Round 3
- |3 y' Y8 Z  j- T7 vs 8 = 7 < 8
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7 [2 z, x0 z8 ~" ^8 N1 vThe answer is 7.+ u5 F! i1 |- _

* Q% h+ |1 n/ H/ Le.g. #3 假設13為較輕的一粒# s, W1 [2 [  j, S+ O
Round 1
& j, s! C; ?' a5 d/ b1,2,3,4 vs 5,6,7,8 = equal, U+ S  `( w8 P+ c
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Round 20 D( G# z3 _6 y: W# f$ s
9,10 vs 11,12 = equal
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No Round 3$ G; |- \; U6 F  d' Z$ ~9 [
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The answer is 13.- U1 o. O9 K, z3 r8 l

: K) r! i+ ^8 Y5 a5 Z- m6 I6 g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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1-6 vs 7-12
) o( G, s3 G8 fif 1-6 = 7-12     13 is fake0 l2 k/ x8 ?- P2 A/ l9 D

! U& j" P) `, z: aif not 6 _7 m; S' V/ T: e' h" L* O3 K
  n: |* l" @8 t& _9 e. p) ?
Weight the 2 time 5 H" ~( `9 I" p2 F3 X
9 t6 X6 B! _5 i6 ~$ C
Suppose 1-6> 7-12
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* K# P: d' L/ r' g, |1-3 vs 4-6
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Then Weight the Third1 ]4 j% X) }! x. x5 Q8 `4 L. \
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Suppose 4-6 > 1-3
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! C# H) ]  a- |5 N) W# NJust like the first Step
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/ s0 I* P8 a* H3 N- L1 ~4 vs 5
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if 4=5 6 is the fake one : o3 |$ y( A' p7 ^; h$ v1 W
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if 4>5  4 is the fake one
5 d+ d9 \( S$ ]; G% y* Land so on......................

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; V9 ?- e" }% e% B+ d問題第二步* e0 Q2 T$ Q! b- @

, h- s# I6 w, K5 @$ P+ ^( bWeight 1:  1-6> 7-121 X! w% E* ?0 o8 Z/ i

, [" G/ d' ^# w0 m1 oWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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0 ?$ C8 r# @) J你第三步点去搵 7-12 边一粒???
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; t: D, F1 B( z6 U  R% n3 ~問題第三步8 I/ t1 E4 g  c1 C# M. s
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Weight 1:  1-6> 7-12
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5 A  O+ c3 h; ?1 m: w  WWeight 2:  4-6 > 1-3 + M  \: c* T. m5 c6 z" t! M) r
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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