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" A6 g2 z( B( U3 H% p% ]
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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 e1 f3 o: ^4 {0 s
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？』! a4 `1 _5 q& ~0 m* K) A
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注意:
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( g' }) F* v& ^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' r; N& }6 N: W' r) k0 U% z6 W: }+ H
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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:
; V/ o  Z+ t  d3 O' v' p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,- O; U6 [" f- W" p
等我搵下仲在吾在. x2 u: G- m1 z4 o
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當日用左37分鐘答１２粒波子，差７分鐘才合格。7 z+ t$ V6 J7 _' h+ |
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:
, `4 C- k% |0 X- }$ o; e* X* G2 u' r: Q9 g: j. R9 U9 t
我以前畫左個chart去答,
& v* E" x" [1 |5 }4 k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:
3 D% _# z) Y5 Q& s( z唔識隱藏...已經諗到..

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$ l1 c! Z+ P1 {, W, O) j% u2 I& m& Lsor !!!....e加改左( H. d) d/ b( a2 C

, ?8 C2 o: x! P1 x7 j4 R' F3 F2. 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2 I1 ?. H3 k  B7 d+ d
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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 ~/ u) ^4 e; S  S
相信e條題目都有吾少人玩...

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# y+ P7 N8 w: HPlayPlay, Let me know later who has the right answer and I will add points accordingly.$ W2 O1 T) P# W) o6 o

; z/ P: c4 w" |: b; x# \( wThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:$ y8 i6 |: M- H- y2 x; ]% c

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

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# l' P, e4 p0 F6 W不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
6 }6 m0 Z7 {* P$ w) n1-6 vs 7-12
0 i) W9 a  O/ @7 q! uif 1-6 = 7-12     13 is fake  L$ X( t7 u: |7 P

6 A) i- G/ `- }2 ?! U: n5 B7 Aif not
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Weight the 2 time
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Suppose 1-6> 7-12" n6 e* a) u4 m" Q8 T* l, W
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1-3 vs 4-6
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% n+ d3 F/ a5 q" j3 C) z# X) N, QThen Weight the Third
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Suppose 4-6 > 1-3( @9 \2 n  H8 |0 V- y/ N
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Just like the first Step1 X  ]. j$ ^4 N/ ~+ I, s) \9 }6 G6 L. L

2 `4 @2 S/ w0 A5 a: x- J8 |4 vs 5 : y" P. P$ p6 F5 t3 o8 u/ q

; `8 c9 B$ R2 A, A7 gif 4=5 6 is the fake one
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3 T9 a! s% Z( Z6 d) u4 Qif 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤/ G0 m/ b) f+ P# i3 F. o: R

( s9 U+ I4 s$ N# B0 l6 g8 CGroup A: 1,2,3,43 \8 I' l, {- n" M+ M  \
Group B: 5,6,7,8
* R+ Q8 o; D6 [( ?: FGroup C: 9,10,11,12' Y5 `- U9 G0 N* Z% U) m
Group D: 13
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Round 1
* `; A( Q9 `( A6 d/ T% EGroup A vs Group B4 W* y5 q0 d* H* ?* a
如A and B一樣, 即較輕一粒在Group C or D
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% @9 C& O! A, O* A# ]( _Round 2: y( [3 b) e% G! [( K8 K9 C
再在Group C拆成:
& x. G; h2 f  p1 D7 v( }Group Ca: 9,10
6 `( v" x7 A* t! ?' ?( ^0 rGroup Cb: 11,127 [/ \8 n: J  q" X3 L
然後再秤, 如一樣, 即13為較輕一粒." m/ e, z6 \1 t$ L$ p6 G
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如不同, 即較輕一組有一粒較輕波子在其中, 1 W! ]& y3 A7 k5 w4 @
要再秤, Round 3, 之後便知答案.7 f. b8 e* A& R3 l: ~
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e.g. #1 假設10為較輕的一粒8 k# V7 Z1 ]- Q4 C2 B3 r
Round 1
/ d5 A" _' U/ x/ o1 o/ c1,2,3,4 vs 5,6,7,8 = equal
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$ _. a: f5 l! W0 r: q% @Round 2- G. k' d$ v) s
9,10 vs 11,12 = 9,10 < 11,12
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' e/ ~' G/ ~0 J+ l- a1 VRound 3
& }  A8 v" R9 w9 B) Q9 vs 10 = 9 > 10
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The answer is 10.) e' W( }% z% o- u7 G  Y: ]* d# F

. A2 Q4 b' I  x& qe.g. #2 假設7為較輕的一粒; ^1 P, x) U& `" q+ R* |2 \
Round 1
6 p1 q3 t% e+ k8 i1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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9 N5 X, w, y6 ^7 n5 r* |1 IRound 21 d! E% [  L0 k6 n- N5 ~
5,6 vs 7,8 = 5,6 > 7,8: x9 j7 M$ ^0 p; y: X
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Round 3
% X* Z/ p; k9 C5 M" j: R7 vs 8 = 7 < 8
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! j6 L! K/ `' yThe answer is 7.
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e.g. #3 假設13為較輕的一粒; S& }/ u8 H+ M2 ^! ^; R
Round 1
0 h; ~$ M: n5 E5 w, q5 F1 @1,2,3,4 vs 5,6,7,8 = equal
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Round 2$ v/ A7 H; a1 h5 I" v, n, V
9,10 vs 11,12 = equal! z& j. z5 Z' T( \* n

  B( r$ c+ T  M- t( h& `# M6 N9 |9 ENo Round 36 N; G7 l% B1 C. d) @6 {- U* x
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The answer is 13.; e7 q! w; d8 L8 |# V" ]5 b; `4 m
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唔知我答得正唔正確呢?! 6 H4 f* d% \4 t0 D! Z) ]2 X, ~
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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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7 r3 e( _* ?) P8 s( d. d1-6 vs 7-12
5 a: H) _& @( [0 C- P# ^8 r' Cif 1-6 = 7-12     13 is fake+ g  g- U5 q  N: m  S$ n7 |

4 V! d0 Y; d+ T  ?% Wif not 4 ?: d2 {3 X* N& M( t

# @" [6 y1 P: I6 NWeight the 2 time % t+ `! _: S/ Y9 a9 O
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Suppose 1-6> 7-120 f: N7 z, f7 r- k$ @8 N. s0 b6 ?

$ b; L; t- C' m" A1-3 vs 4-6
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Then Weight the Third
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  |: A. B  q' H+ w7 BSuppose 4-6 > 1-3+ l5 F* e" T. Y( w- ]) \8 m
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Just like the first Step2 o/ ~$ R' E6 Z# m) h* B

2 M$ j/ W! W/ i# h' Y5 M" ?7 Z3 s$ m4 vs 5
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0 H3 Z& B* E3 m0 @if 4=5 6 is the fake one
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0 M2 q( O; e1 {; a# j: u/ y8 Bif 4>5  4 is the fake one
3 U9 C7 K7 _' X2 j( L. land so on......................

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問題第二步
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Weight 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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你第三步点去搵 7-12 边一粒???# X" O8 f% j9 Z+ O: d: ~$ J+ n4 |: H. M7 m
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問題第三步
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: _& ]* l+ v; [Weight 1:  1-6> 7-12: W3 l2 L0 [0 h" f

) D% h/ E% a% W) A5 gWeight 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