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)。
  x' D' E* T% y% v7 c) O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？』8 `$ F" U* r9 N

. s6 F5 z5 v4 d% _9 E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2 ]  ~) J. U) p% J: 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  , 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:* H& A) j! m) J
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,: `) N$ F6 r4 |
等我搵下仲在吾在
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當日用左37分鐘答１２粒波子，差７分鐘才合格。5 m* O1 r) k! U) p" T
13.........- i0 Y8 W$ |  f  j% d" P$ v
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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:: `; H/ c0 b) s, M" Q

( X! [. O4 r: h6 D0 Z9 l4 s我以前畫左個chart去答,( S9 F# ~! G7 s$ ~0 V7 M6 ^/ \
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:
2 c8 X& r8 [* p& u, Y2 A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) ]3 W, T0 a3 |5 A
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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:- H1 M! \+ K  O
相信e條題目都有吾少人玩...

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: ?+ p+ a; n( ]* V8 aPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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3 f. x$ J; N" A. QThanks

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.
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% w2 a0 T. u& p% r4 l$ YThanks

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/ E# i3 G3 K  @2 r' z不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
" R1 A( e& ]' P1-6 vs 7-129 ~5 \; R5 \2 D
if 1-6 = 7-12     13 is fake
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if not $ S: n3 L. r0 [; S, H9 ~, S7 E1 }$ I

% [5 Z. c2 n2 S. K* i  fWeight the 2 time
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8 W) M, L& j3 T7 ]1 n4 P; R* iSuppose 1-6> 7-120 A% \  n" _+ {- z
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1-3 vs 4-6
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& j0 W) S# q- C" g* _6 }) h' k0 f# E5 YThen Weight the Third- i8 e2 D* W, t" W5 {4 O. o
3.3 }) @$ z9 T- o7 J+ D) P2 d1 }

! @- `, x8 e) QSuppose 4-6 > 1-3
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Just like the first Step
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if 4=5 6 is the fake one
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3 ^1 o6 p3 G1 N1 r  D8 P. oif 4>5  4 is the fake one ' I* ^1 v5 {/ g; n

4 L' l) u; b. N* x% _6 jand so on......................

hello1997

分3組4隻波子秤
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  n3 p  I$ X9 E2 T% _# k) gGroup A: 1,2,3,4/ F0 S0 y& P* c5 D9 h- u
Group B: 5,6,7,86 y5 m: Z2 f# y3 b/ t
Group C: 9,10,11,12) Q# o9 Z7 T) T2 J. v3 R
Group D: 137 \- |2 ~$ G3 b
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Round 1
% @+ o7 b0 W! z  l1 cGroup A vs Group B0 v, g" n8 M1 G; s! t
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
8 u* Z# U: v% Y" m再在Group C拆成:
; @/ y7 k0 {- nGroup Ca: 9,10) ?/ X1 v; y9 E- h
Group Cb: 11,12
3 r7 r/ e$ \& c然後再秤, 如一樣, 即13為較輕一粒.$ y2 R% w( W7 q1 e. C  D, W
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如不同, 即較輕一組有一粒較輕波子在其中, 9 c+ s* u; v3 g* I, T5 a
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* w" z  C, M, l5 z' C
Round 1
4 Y6 L7 K$ T! I- O8 W! V1,2,3,4 vs 5,6,7,8 = equal  g% j, c  B- [% l) l

) ?; H  B8 o7 ^' @6 H8 QRound 2
' D' `$ _* x0 _+ b1 L4 b9,10 vs 11,12 = 9,10 < 11,12
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Round 3( ^3 |' k. N9 f  \0 X3 b# ?8 T7 N
9 vs 10 = 9 > 10
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/ ?" z4 B1 K3 @4 {( l& P& kThe answer is 10.
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e.g. #2 假設7為較輕的一粒
7 z  W' t* T# pRound 1. P4 R# A5 O6 R) k, [$ T
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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- _8 s7 t, Y1 ^. \1 u4 K+ \Round 2# c8 Z, k7 F4 l% u; E& k
5,6 vs 7,8 = 5,6 > 7,8% L& Y- A9 @) s  Q7 ]
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Round 3% d4 j, E- t0 B" y: Q  D" ?1 V, D! Y  G
7 vs 8 = 7 < 87 A$ W* q$ C) Q6 f/ Z: }- S4 s

" l6 x) K: l# t0 [5 XThe answer is 7.
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e.g. #3 假設13為較輕的一粒
3 z2 M' A+ R6 x+ I" f$ WRound 1
0 @9 e) B% v4 l: b8 q# d5 {1,2,3,4 vs 5,6,7,8 = equal2 Y  s+ P* U7 A% J( D) q! I
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Round 2
5 {/ l* u; `4 T" k5 S9,10 vs 11,12 = equal
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No Round 3
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The answer is 13.0 D( p6 j' B# e' H& r

8 {/ x! ^, L8 c4 e# ?' R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:& z! r9 t2 T8 j/ O6 \2 D7 t; D
1.
4 [  T# \" \9 e) ^1-6 vs 7-12
# A7 |. C1 ^6 y1 A; @$ K3 P2 G% hif 1-6 = 7-12     13 is fake
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5 h5 }) n5 r; g% K2 P8 kif not
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4 _0 Z/ p  F6 A- y9 M0 n  ^Weight the 2 time
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' I7 `) c' y8 o  ~% mSuppose 1-6> 7-12
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/ C8 B% X: u2 b5 v# K1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3' f( f' f) ^0 {  r) F7 L% J
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Just like the first Step+ x) }+ X3 d7 n; K# ~
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4 vs 5
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' H" J- P' N6 b& oif 4=5 6 is the fake one 8 G7 D/ h% [, z7 m( O1 }2 y
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if 4>5  4 is the fake one
, R, c# o2 t$ g8 xand so on......................

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問題第二步) V" ~- @' }8 \/ b% h4 o

( f8 Y$ |, Q" tWeight 1:  1-6> 7-12
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2 O& V6 B6 c$ |! ~1 ?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???* b  A1 c1 y/ B- n2 ^( ^) C
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========================================
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問題第三步& J6 z  t5 e% h6 u5 V6 i& N

: W' Z, C8 |! A- t) jWeight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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4 {( n: t  V  O' v$ f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