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. e* w7 ?; v# \4 c5 _( P$ |

, t8 H6 ]) T+ s6 i『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' P1 Z" }- Q) x; P
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？』% A' I, B0 P5 @, i! R
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注意:
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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
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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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+ [8 u: P. X- W% E6 Q% j% {! S[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
4 M+ k! [( ?$ M1 k0 Y+ q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,
0 \/ X  `7 Z- ?' G等我搵下仲在吾在
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, A$ X' y7 ?7 s- r2 i, |當日用左37分鐘答１２粒波子，差７分鐘才合格。  g! y, x( W( }1 C
13.........' w0 e. p0 q& k+ D& Z) \; [

. J9 r1 S% l% |2 r# X( e[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:9 s4 _6 B: R3 ^: k9 x: A
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我以前畫左個chart去答,4 Z9 N0 m! D" ^# k# E! I1 M, ]
等我搵下...

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$ ~) j" q" T2 @. u  s4 W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:
2 w5 D  c9 \( q: l, T唔識隱藏...已經諗到..

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sor !!!....e加改左
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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, q' y- T- E& B/ u" D: v/ X

' U8 K0 m1 m5 c$ c[ 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 @1 `  [+ ^4 J相信e條題目都有吾少人玩...

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; J+ ^8 P9 {6 G6 N8 Q" F& [PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

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.3 z: m2 e+ ^: v# k
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Thanks

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5 m! p7 R- w/ v' u8 M不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
! \" i. |! I8 y8 G+ }1-6 vs 7-12$ |$ K8 Y6 z2 H( I
if 1-6 = 7-12     13 is fake3 r! L( R, a& N( `

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Weight the 2 time
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; t* G7 G1 Q0 j6 [Suppose 1-6> 7-12* _$ [/ u3 u5 G

: P: i  G- {, j% r4 F0 {: z1-3 vs 4-6 " k$ I2 Z, |( c0 c* C
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Then Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step# p# P) g" H& K2 Y

/ Y# J& {3 z% o- p  W4 vs 5 4 ~' M; e2 M: Y: \" {% j6 f

: O' p/ C2 L. ~if 4=5 6 is the fake one
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* e9 v6 [6 x, B% Vif 4>5  4 is the fake one 1 {+ f4 Y6 H! R) K4 L
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and so on......................

hello1997

分3組4隻波子秤+ V% E6 I% J; V" }9 A* A

3 d  K" C+ I1 L, A4 Y! F* N, dGroup A: 1,2,3,4
) J) K% F2 Q7 V: G% VGroup B: 5,6,7,8* D2 H, H, b" I0 V$ }+ d
Group C: 9,10,11,12* |! G: x# H" M; z; p
Group D: 13# F) p- a3 ~% z/ Q& g) g% O
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Round 1' N8 ~4 z- n# k  J6 j9 c. D7 |  X
Group A vs Group B' }* ?: V  ]5 [% w
如A and B一樣, 即較輕一粒在Group C or D6 m6 R6 h. N* O6 \
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Round 2
, W. R2 t& t$ g7 b( p/ ^2 P. a" y再在Group C拆成:1 [  y" }) k7 x4 K! |: u
Group Ca: 9,10
3 k" [1 v  {' J: {# BGroup Cb: 11,12
5 v* ~9 p7 m$ ~然後再秤, 如一樣, 即13為較輕一粒.3 s2 ]- v/ W  |/ Z2 @7 `7 F5 k
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如不同, 即較輕一組有一粒較輕波子在其中, ; B, @4 E  n' i) h
要再秤, Round 3, 之後便知答案.
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e.g. #1 假設10為較輕的一粒
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1,2,3,4 vs 5,6,7,8 = equal5 q" n8 R$ j# f
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Round 2& ~' L4 P+ C- W' X
9,10 vs 11,12 = 9,10 < 11,12
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! A+ F8 _& h8 c1 M3 d" [+ a; T0 DRound 3
* W) _0 F' K) X$ }' j% M9 vs 10 = 9 > 10  h" s" z, B. d) e$ z
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The answer is 10.3 E! v8 w& j0 R& @4 o6 l. v

5 W5 d. @# M4 q* B6 @e.g. #2 假設7為較輕的一粒. D1 Y* `( t* ~" ~" V3 E
Round 1
2 G; \5 P% Y4 _& i' j0 c/ f) d1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8; J- }+ \$ v" z5 M; m
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Round 2/ D4 F+ s5 i8 ~% ~
5,6 vs 7,8 = 5,6 > 7,8
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Round 38 a( ~2 G6 @4 ?
7 vs 8 = 7 < 8
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The answer is 7.* l# V$ ^: Y8 p  v
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e.g. #3 假設13為較輕的一粒/ U% G) n7 b# U2 g3 b* z3 R2 A" e5 W
Round 1( Y" F/ ?& k0 [5 B4 R1 p
1,2,3,4 vs 5,6,7,8 = equal
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3 D% F8 r. q& w. Y" MRound 2
2 _' @& {& P5 k: N! f9,10 vs 11,12 = equal
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No Round 3' b7 Q: k! j  a/ }4 t' S9 _

" E' F; `+ L( N) nThe answer is 13.
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唔知我答得正唔正確呢?! 4 a6 C7 \* l1 I+ w8 u+ 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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1-6 vs 7-12" P: q$ J( v, O- U& N' ?) R
if 1-6 = 7-12     13 is fake
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if not ) a' p4 e' R. X4 {

/ b1 x/ B- S. |9 XWeight the 2 time ' M4 C! x4 }2 X+ O4 ^
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Suppose 1-6> 7-12! w* ^! G& W: M  x/ R- y  {
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1-3 vs 4-6 6 F7 r1 J8 f$ |
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Then Weight the Third
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Suppose 4-6 > 1-38 t- b3 s0 D& }- d3 A9 A

5 i1 C5 k' {/ Q" q. |) ?0 [Just like the first Step" F: N5 _: K  H/ F

1 }7 W, J' L' Q( r4 vs 5 ' ~. l+ e6 h' w+ v
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if 4=5 6 is the fake one
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if 4>5  4 is the fake one 8 M/ _% Z+ V# t5 \! L; h4 l
and so on......................

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問題第二步  h) J$ \5 C' r& X9 @% U* U
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Weight 1:  1-6> 7-12
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& E4 B0 _- d+ X6 [8 UWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6# L% _  Y& q6 f! O! H7 {  H% f! r

( j$ ~/ Q" ?/ M! B你第三步点去搵 7-12 边一粒???3 z4 P3 A$ R$ n( C" r
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問題第三步
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Weight 1:  1-6> 7-12
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, U9 O! J) g. \. oWeight 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