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)。1 r! x" w9 r; 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？』& e6 ?4 f  c  b+ E7 c% h- v
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注意: - [: I8 t0 }# k) y! Z% K0 G0 M. ?
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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+ m9 {% q+ B& {$ w- R' L" `/ f

; ~8 s) W3 d7 V  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
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" l+ N* U2 y) f5 ~0 q[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
3 U  _2 ^! a2 L3 c! n/ {/ q$ h相信e條題目都有吾少人玩...

/ `2 {+ p1 w4 e/ d我以前畫左個chart去答," q# [% F8 [0 ^4 `  E
等我搵下仲在吾在
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$ {, u+ i6 V7 I2 P' q* \& }$ y3 ~當日用左37分鐘答１２粒波子，差７分鐘才合格。2 C- j* g& k' x5 ]! z7 h2 h7 n
13.........# ?+ f7 U$ v5 Q- T  |1 G3 G

" h+ P' C5 s9 @[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:2 ~( `( I# \  w
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我以前畫左個chart去答,
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+ H6 P  e9 P- q# o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:: d5 {; P4 E* x7 v
唔識隱藏...已經諗到..

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sor !!!....e加改左  ]$ @! X" r' {% X7 }
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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. ?7 Y" S3 g' p. i7 P" E' z1 G# u
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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:( b2 [% b7 _& f5 D
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.5 @. S. \$ p$ O

9 w! \. Z1 G- i* o- d5 f3 uThanks

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.1 Q! \5 o  E) Z
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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

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1-6 vs 7-12# |. }  S" X0 c: [% c+ l3 P' s
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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% S" r8 I$ P3 |5 ]6 H5 R! x* }% fSuppose 1-6> 7-129 w3 u% m; ~. o

( w6 O1 P  u/ A3 y1-3 vs 4-6
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Then Weight the Third2 P5 _8 v- B+ g' P
3.
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+ G7 Z, k! }* b: f( v1 TSuppose 4-6 > 1-3
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* d6 v( d: M1 ]; J0 @Just like the first Step
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& G" E& Q; G0 W: P. h  ~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
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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
1 t2 N( y- I$ JGroup B: 5,6,7,89 y3 F( w- c( b
Group C: 9,10,11,12  x& W. M8 |+ H0 _5 x6 V
Group D: 13
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4 b/ J; o4 X8 S% Y) MRound 1
7 c$ z. @# w5 t" C, s; x2 A$ `Group A vs Group B
8 Y+ e: i( J, _- p如A and B一樣, 即較輕一粒在Group C or D' D2 V. V  E; q; f- ]& ], ~

$ t1 P7 d* t3 m" S5 \* b8 \Round 2  e& E% E1 O# a: l5 V
再在Group C拆成:5 T- ?* o' ~% V7 T4 i% P
Group Ca: 9,10
" B& w* ^1 I& r" F# i  XGroup Cb: 11,12, Q: X: V& q5 U* Q
然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中,
( U9 ]" A% [6 S; V1 n要再秤, Round 3, 之後便知答案.5 r) z' P  @- v$ u1 A
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e.g. #1 假設10為較輕的一粒
' o3 ]: \- @4 x8 ]Round 1& ?* n* T1 w$ B* `1 i' M- H
1,2,3,4 vs 5,6,7,8 = equal  E8 Q& ~/ ?4 C4 I7 v
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Round 2
9 q, }2 _2 q9 t6 r# o" {9,10 vs 11,12 = 9,10 < 11,123 y1 J- I- J' P5 q8 E
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Round 3
5 x. A2 v# g5 t" A6 q" _4 C8 c9 vs 10 = 9 > 10
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The answer is 10.5 H, o( J3 p6 y: g1 G2 L  b

3 u4 E9 j$ S0 c2 B% ~1 a7 y# Ne.g. #2 假設7為較輕的一粒
6 [* j" x* F5 l4 h- P7 CRound 1
- `) j2 a( Z1 B7 D1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8. ^. l6 f% ?+ x6 F

  T- x$ T4 k2 zRound 21 R, F, L( K  ^5 w5 o* i% S$ R! k8 w
5,6 vs 7,8 = 5,6 > 7,8
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Round 33 W) W. Z$ X7 g8 s7 n
7 vs 8 = 7 < 8
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4 v* S# l3 I3 B/ N$ HThe answer is 7.
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0 D8 i8 B* g- G! r$ r1 ee.g. #3 假設13為較輕的一粒
2 l( d0 `$ e4 p+ A4 {Round 1
6 n- h9 P  P+ [1,2,3,4 vs 5,6,7,8 = equal
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& w& v1 Y( V$ S$ B% qRound 2
7 h$ X# m1 K5 j9,10 vs 11,12 = equal
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. i6 d8 L0 H/ E3 u7 z. t( \No Round 32 Y5 H1 W8 c7 Z9 T' |8 J. s" O; `

3 _# D" \. e4 E! p4 JThe answer is 13.+ D, y& {/ G; k, ]* O+ j6 f

; M, Q1 O9 T2 c" T8 x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
3 o% r9 y+ l  A& I/ E# s( Q& X0 w( E4 nif 1-6 = 7-12     13 is fake+ v6 ~) ^8 U; }  n1 F  c9 |
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if not
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9 r; p0 t! g/ ~8 W6 e! WWeight the 2 time / F3 s# f1 V8 t( I
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Suppose 1-6> 7-12  ~: @! ?+ Q& I- G$ I* ?9 u
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1-3 vs 4-6 / Q- d& G3 X2 T8 q3 H
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Then Weight the Third/ a- n+ P0 b% Y9 Q6 ?  a
3.
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Suppose 4-6 > 1-3; g0 z) K4 e1 O
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Just like the first Step" ]' r! J" ]# l* p( q& f. C% R/ [* i

. r7 [6 x7 \# E: J4 v( }# M4 vs 5 , L1 o# ]$ A( o* @  V

3 _1 m6 P2 y) U+ w$ Jif 4=5 6 is the fake one ! r6 b0 c8 q2 |# N, j  f

, n/ X! G! \: p% h, K$ ^# Iif 4>5  4 is the fake one
& ?1 g1 f% C( w+ Y' k; n  @and so on......................

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問題第二步
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Weight 1:  1-6> 7-12* U" d6 I$ M. M" ~; K

2 D. d/ H" A" c: x/ qWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6" Y, s+ _& G/ t: [9 B+ s
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你第三步点去搵 7-12 边一粒???
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問題第三步, I& \1 s6 |5 D: `1 I
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Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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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