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)。
) ]9 Q4 x3 G& J/ i. N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？』
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/ b7 P9 E2 Q+ c7 n- E注意:
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; l6 L+ I, l, M3 N5 c5 A1 e1. 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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: L9 f9 g; B/ J- p2. 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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% G; ]" b2 o' R2 i3 O[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:! n; V  S8 u' h0 K, m* d* K& z: x0 o
相信e條題目都有吾少人玩...

' K- R' l1 _5 V3 ~我以前畫左個chart去答,; s6 H5 M4 a' i' K8 l1 I5 [( L8 L
等我搵下仲在吾在( L& O$ w$ }+ V4 J7 F9 ]3 R
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當日用左37分鐘答１２粒波子，差７分鐘才合格。  z8 V9 M9 X3 L5 C# o( k" [
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:7 f+ ]2 e0 w9 Z5 w1 i  t$ X- c6 t9 Z1 a
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我以前畫左個chart去答,
# J3 N$ ^* K1 v% s' K# x* B等我搵下...

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" r% q  L4 X$ {& U. J- 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:
* V: L7 m9 B7 j% N+ N3 l  d5 x唔識隱藏...已經諗到..

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4 i+ Y+ p6 P+ V: psor !!!....e加改左
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. m, }6 m$ X4 q( i" h2 n  g5 n2. 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
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$ T  @5 M+ I; ~' ]# N[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
/ H0 Z8 p3 d! b: K% o) E+ {相信e條題目都有吾少人玩...

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* H/ U+ G+ D$ C2 ]& D; q2 XPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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0 J& P+ W/ [: S8 I. A, J: ^/ DThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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: t" x4 t. X/ fPlayPlay, Let me know later who has the right answer and I will add points accordingly.4 }  A; A4 }: ~
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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.
9 H' h$ Y' B" _7 b8 n1-6 vs 7-122 j+ M- n7 m: Z- Z1 L
if 1-6 = 7-12     13 is fake: s. C$ u, p5 k9 b$ I" q
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if not . T) q# e0 r* O, O3 p3 H4 j

% F$ Z7 l  m5 B; u! D8 |1 E1 xWeight the 2 time
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Suppose 1-6> 7-12) \0 S( @4 _4 ]. k- b( N8 D6 F
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1-3 vs 4-6
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. ]' Z& n, A! ]" w' `8 kThen Weight the Third
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Suppose 4-6 > 1-3* t/ }  u, r9 W8 F" I
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Just like the first Step
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4 vs 5
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if 4=5 6 is the fake one
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) e# b# ]: a$ h2 v: m" \if 4>5  4 is the fake one
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# b7 X: e" t" s% R: {and so on......................

hello1997

分3組4隻波子秤5 \8 |4 ?; @- l& Z# A

+ Y" O/ \1 U  y/ [# O! YGroup A: 1,2,3,4
8 B2 T5 y" _. N; }/ }: F! XGroup B: 5,6,7,8
1 }. T$ V/ v* u, w5 ?% F; Y! CGroup C: 9,10,11,12$ ^/ ?. @3 `; N/ N4 t
Group D: 13! K% M6 ?) w( {) `

* q$ \! F8 R) H, xRound 1
; V2 }! ?7 M; i3 w! u/ |Group A vs Group B
" `) k: Z+ C$ F* K$ X% a0 A/ B如A and B一樣, 即較輕一粒在Group C or D4 |$ M  U) l* B$ Y$ e

: ^/ H* Q" M0 ?( }) g5 \# jRound 20 O7 ?4 t: V6 x7 l( q9 d
再在Group C拆成:
2 J# W# U, ]& c( R" d$ Z; {, PGroup Ca: 9,10$ y' u* B" v$ ]& t& `
Group Cb: 11,12- r* R3 ?% m6 k5 l. V* i
然後再秤, 如一樣, 即13為較輕一粒.+ s  v8 r1 N, q" G( ^, n
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如不同, 即較輕一組有一粒較輕波子在其中,
9 i) ~" K( r  O) U2 d! C3 f# k) ?9 z要再秤, Round 3, 之後便知答案.8 l7 t$ y: q. \

: h* G- e0 O5 Y/ `) w7 J4 Xe.g. #1 假設10為較輕的一粒" b4 q/ ~3 k6 G; i" S1 \& b
Round 1* U- c0 I. F  \# O
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
! P4 m% t$ a8 u; N" z# U( T9,10 vs 11,12 = 9,10 < 11,124 J6 d2 ^& c& N0 f

  L. B4 L. M2 U. f" ^Round 3: m0 q# A5 K! g0 p8 C$ K, i5 z
9 vs 10 = 9 > 10, F4 Q. |& `+ ?- F
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The answer is 10.8 u  W3 e# r& {3 Y+ l- B. K3 k* \

0 Q* ]* y2 m/ G5 K0 r4 |e.g. #2 假設7為較輕的一粒
1 Z& K" R! Q$ h, L8 ORound 1
% G, r5 b! S) E( ]1 s1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2* V5 c9 v4 g" d& t4 Q
5,6 vs 7,8 = 5,6 > 7,80 S% c- o! p* o/ \9 X2 ^  ^$ `8 a
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Round 36 o( l+ f! ?! U1 D
7 vs 8 = 7 < 8
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The answer is 7.
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# k4 B& y  g$ ], Ee.g. #3 假設13為較輕的一粒
) t, Z( H# w$ KRound 1
- S( E% b: F; f3 X1,2,3,4 vs 5,6,7,8 = equal
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( D$ U$ u( @# r/ g% ZRound 24 \/ W# {! ?, i& g7 A
9,10 vs 11,12 = equal
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No Round 36 e7 x; a6 e: S  n- r

* B9 P, g' E; D' Y9 o! w& ^8 RThe 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( ?+ }5 a4 {9 Q1 w) \% F2 q; f
if 1-6 = 7-12     13 is fake
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Weight the 2 time 7 X: x  K1 m, y* h$ K6 z
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Suppose 1-6> 7-12
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4 C3 b& e0 J& \: L1-3 vs 4-6 5 H. r$ A: w6 n. S" d

6 h+ |) W' S9 ZThen Weight the Third6 a& Z; b- v* u1 L, \
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Suppose 4-6 > 1-3
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% f3 O9 f. m: x( O+ }; C& SJust like the first Step& P9 p- {1 p) V
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4 vs 5 / f4 t' N& G$ _- _: g7 K5 d2 l
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if 4=5 6 is the fake one
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6 {$ X3 X% p6 G& g+ u4 bif 4>5  4 is the fake one
' X3 M) Q: l$ Y0 z* N6 _and so on......................

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問題第二步
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8 w  j, N$ G! d7 E6 R- iWeight 1:  1-6> 7-12, O" F: M+ n2 I4 r: j- c8 a; x1 a
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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1 u* `* N- G6 l  T2 v9 `& @( p你第三步点去搵 7-12 边一粒???* U$ n0 d! C: I
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問題第三步
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0 |, ~) x% Y# ~# b2 EWeight 1:  1-6> 7-12
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" h- M3 C: G6 M% FWeight 2:  4-6 > 1-3
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8 G; R8 G. s% Y5 R3 i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