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) Q# ^7 J' T/ C. h: n
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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)。2 n2 V. B6 Y/ C! 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？』. Z/ [; q  c5 L
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注意:
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" S& t$ T1 \. 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
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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* G2 q5 a: b4 d. W; X$ V2 B

4 U, W8 ^/ \5 ~& m[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:! B6 ^( f7 J4 B* F3 b
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,
: `3 Z2 ^" G2 O8 K; X% `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。4 {8 B0 ?' i( Y- @( A& T' }) b& l* |
13.........! s9 [7 x, d6 {; ~3 y8 I5 m- J
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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:
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  o0 {4 R9 K6 m. s) p8 ~, J我以前畫左個chart去答,! c! d  `% Z- W9 Q
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:7 Q$ W5 X- {, [' Z" z4 B
唔識隱藏...已經諗到..

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sor !!!....e加改左3 q) v' E+ _# r4 F& f# r
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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% S1 |1 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:
$ ~3 |. ~3 m: J! l2 C- e' p; w相信e條題目都有吾少人玩...

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7 k# y: K8 V0 z4 n2 ?9 @PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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. ]( }# j% [$ ^& HThanks

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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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

1.
" h  p5 m# i7 w1-6 vs 7-12
8 u: w. |3 ~5 d* @* Kif 1-6 = 7-12     13 is fake* F9 w& C- m8 c% Q* D

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Weight the 2 time ( b) U* g/ y4 i( f/ T, h
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Suppose 1-6> 7-12, d. ]+ b$ n' B7 q6 O1 s
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1-3 vs 4-6 5 _: L, \) O7 k( R0 Z# g

( s" L3 g7 v/ CThen Weight the Third
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Suppose 4-6 > 1-3* g! F: a( G) |8 v' _0 }

; l/ U! U. r8 x( X. h4 y( L+ zJust like the first Step
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# ^9 u; |( j; m; A% `4 vs 5 ( b6 u& S% d6 c' E
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if 4=5 6 is the fake one ; F6 m- A7 G/ E
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if 4>5  4 is the fake one
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$ t! W* v& |- ]3 f8 I+ @and so on......................

hello1997

分3組4隻波子秤8 m8 q1 T% n# ?  h

6 {- h( i3 {( A, [/ ?( b/ ?Group A: 1,2,3,4
! Q: J) Z. S* Y. X4 D  L( WGroup B: 5,6,7,8. B  _  u3 o3 C" D* j
Group C: 9,10,11,129 J8 u3 R& l- T/ H: `( Z/ V
Group D: 13; F. L  c% _# O* R/ d- b" M) x/ [
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Round 1
9 g9 Z/ d$ w; X6 xGroup A vs Group B8 R2 c: C% y, P5 O' e" u
如A and B一樣, 即較輕一粒在Group C or D: i4 v- e9 y' Q* p5 R
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Round 2
9 t  M+ N/ k" y, G, j再在Group C拆成:& x3 S5 U0 R& x* R- ]( x! U+ }) q
Group Ca: 9,10% C) B2 }3 W# I/ n8 R1 ^, e
Group Cb: 11,12
1 ]& d. k# `% k0 u9 l* b/ X然後再秤, 如一樣, 即13為較輕一粒.
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% f" P: y8 j# A/ L, ^# a5 d如不同, 即較輕一組有一粒較輕波子在其中,
' |' i3 L2 c+ J- |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7 U# h5 @( `3 ?& |
Round 1. O4 h$ d; b+ k; P
1,2,3,4 vs 5,6,7,8 = equal
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Round 2, J# @9 s" ?1 ~2 T3 N/ M6 ~8 K; u5 X* w
9,10 vs 11,12 = 9,10 < 11,12
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Round 37 u1 X9 S& H) f6 j) K7 S4 d
9 vs 10 = 9 > 10
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The answer is 10.' ^/ L* u+ Y* ?" R
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e.g. #2 假設7為較輕的一粒
6 e1 a* w4 z. f  `* sRound 1: z- Y: w4 N3 q! b4 Q) N1 l
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8" [" n7 x5 Q5 w" S% ]4 e& E
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Round 2
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& P7 Q- l9 }4 {% bRound 3  O+ C1 q" H$ s( }& i4 l1 T3 w$ E, T* m
7 vs 8 = 7 < 8. p7 V! U! R1 y# o
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The answer is 7.
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e.g. #3 假設13為較輕的一粒
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: n2 i; D. K$ L/ r" L1,2,3,4 vs 5,6,7,8 = equal
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Round 2% B/ S& b: @$ y+ Y" G. X3 F
9,10 vs 11,12 = equal
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5 P1 h& {; H) O" g- R+ f4 CNo Round 3
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The answer is 13.
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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, N3 ?' ~- g0 ?
if 1-6 = 7-12     13 is fake
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if not
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0 _2 J& a$ Y8 J% a; ?- [* ^9 ^Weight the 2 time
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' }  `: B" D) G9 _. LSuppose 1-6> 7-12
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1-3 vs 4-6
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9 Y6 Q1 m* @4 n0 i8 _3 V% G$ hThen Weight the Third
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  c. j9 d* b* RSuppose 4-6 > 1-3+ n3 c/ R* _0 o2 l5 M7 l/ w9 R5 y
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Just like the first Step# V9 x5 K; a( q, _# T

9 S' e4 J& C. M7 v) _' a4 vs 5
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0 b2 r3 Q0 f1 S% \4 c8 `1 Eif 4=5 6 is the fake one ) l8 Q* {$ b1 D+ \1 u$ t

7 L' q8 `+ D$ V( s3 u) tif 4>5  4 is the fake one ! o6 D2 C! I! \8 L$ e% k3 T
and so on......................

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問題第二步
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* M, y/ F8 P$ c! `4 f2 cWeight 1:  1-6> 7-12! r7 I6 i$ A0 A2 Q

2 h( n* Y! ^8 K4 w, KWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6- ]' Q. j7 A; {; t0 G. N

' W: e& z$ g" y# a0 z  D' s你第三步点去搵 7-12 边一粒???
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========================================
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4 D& D. _1 m2 S. o7 d" E問題第三步
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Weight 1:  1-6> 7-124 B( L: M4 a6 k6 S3 \
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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