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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) O$ y; N7 N4 S; Z, j6 O『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)。8 d, F. i$ \0 Z! r+ l
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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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5 ?3 R% v4 q; {+ ^  n
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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, E& j9 s# ]" a4 l0 @5 F

9 D9 i& S, h7 b7 [, Q1 u  `9 R9 a[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
0 I, W" c6 ]4 J; U+ {# f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; S1 c; V" ^
等我搵下仲在吾在
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( d( o7 d: e, m, a當日用左37分鐘答１２粒波子，差７分鐘才合格。/ ]6 f, E' ?4 _+ n8 O
13.........& x9 `4 Z) N- v+ [$ k9 c
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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:: k& a: E2 |. O. A2 ]' |3 N

* R+ M5 T9 e/ m. [我以前畫左個chart去答,* Z& ?. J- p( {/ p+ _7 u+ }6 O; 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:' N8 `: {5 {! l  B2 T* J$ ^
唔識隱藏...已經諗到..

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sor !!!....e加改左1 s- [$ z9 u5 {' r& Q# K; _

# n4 }8 R# `0 p) A/ Y7 `' @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" c- o3 E  u5 J. V4 u8 \. W

  r& s% L5 y  N& W3 F' v4 u[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:/ x: v$ I' U- p$ x7 _
相信e條題目都有吾少人玩...

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/ n8 I% i" \: {& r: u7 j+ o4 |( `7 uPlayPlay, Let me know later who has the right answer and I will add points accordingly.& @" I/ y( O0 ~& `, X5 h" m

: q5 e- A% _. ]1 jThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:. D4 }& {6 R- s7 i
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; X+ a$ {' D3 W- m! EPlayPlay, Let me know later who has the right answer and I will add points accordingly.( J. O$ M# |# e8 |9 y$ T

2 ?6 _' r8 |1 m3 P6 ]" ]  HThanks

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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.
, \0 I, i  e6 L/ v. Y1 Y1-6 vs 7-12
! G& i0 J2 L3 oif 1-6 = 7-12     13 is fake
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& z. N, |1 M1 F3 Q/ ?Weight the 2 time 7 D3 U% N" `% f
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Suppose 1-6> 7-12
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  F" f, j& o8 w/ ]3 M6 |( a1 X1-3 vs 4-6
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Then Weight the Third
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% ~4 \4 {. s% T8 B  v0 U4 oSuppose 4-6 > 1-3
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Just like the first Step
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! g9 I/ Z# k" ~5 k# E4 vs 5 + `4 A, O( C) B/ G4 p# k

9 @4 J+ R* V) f' Hif 4=5 6 is the fake one
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if 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤  k3 s& j5 S" y6 N& J+ E/ d6 [& u& U
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Group A: 1,2,3,4
6 Y# a" |/ a0 J2 r4 ^' v5 [Group B: 5,6,7,8
( ?, a8 x+ I% S- JGroup C: 9,10,11,12/ o2 y, E: s1 Z8 S& S' a9 @, L
Group D: 13' A7 E7 W3 i8 g- F
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Round 1! `. T& u$ H. z1 K/ Q) |
Group A vs Group B  Z$ Z% |3 A: B9 }- N5 I/ Y
如A and B一樣, 即較輕一粒在Group C or D
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+ K5 Q& A' z# k0 f- |! ]5 @Round 2
: R9 m% [8 F8 Q6 V再在Group C拆成:& T' F/ u) D8 h8 Q' f4 Y/ o
Group Ca: 9,10
. ]# C+ n! m. k: z7 k+ ]Group Cb: 11,12
% t) U4 \& i, k6 s. O然後再秤, 如一樣, 即13為較輕一粒.
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( `! m: a" f6 `' Q* q8 i如不同, 即較輕一組有一粒較輕波子在其中, 4 R0 Z' Z& X  h
要再秤, Round 3, 之後便知答案.( x4 d* i0 W+ G) R0 X
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e.g. #1 假設10為較輕的一粒
# I. d" F6 A* J, m# M9 O1 jRound 1
0 b0 D& @9 D+ R7 ~& j5 J1,2,3,4 vs 5,6,7,8 = equal
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Round 2' [8 ]* U% b# q' i/ y0 p- g
9,10 vs 11,12 = 9,10 < 11,12
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9 vs 10 = 9 > 10
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% {( a9 F7 d: Y/ L4 D' ~/ s* c- HThe answer is 10.0 Y4 _: W- S, h; i! f, T

7 U8 e6 t9 P6 r6 ^5 B  n5 o+ we.g. #2 假設7為較輕的一粒7 W% f; ~3 Y0 }1 R
Round 1
" p/ ]/ V/ F0 \' R1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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$ |* q( G: e. B5 z7 Y5 Q3 S& s* oRound 2
, v; \2 u. h9 H' w9 H3 s8 U- o5,6 vs 7,8 = 5,6 > 7,8
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  e) @) W$ ~; d! w, S1 y& {Round 3+ x6 b; i  X; t. _6 B* X- W3 D
7 vs 8 = 7 < 8
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  T; _' q7 K% G1 v! lThe answer is 7.% V, A+ R3 w) u
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e.g. #3 假設13為較輕的一粒. |: I/ `8 E$ P" \
Round 12 m/ d( Q/ g: s+ Q4 ~
1,2,3,4 vs 5,6,7,8 = equal" G5 j% J) V" S6 h0 D2 B
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Round 25 Y+ K8 N% I) A6 V: K
9,10 vs 11,12 = equal
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No Round 3' l2 B8 ~+ H  D# N' t2 I' i; n
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The answer is 13.
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9 s* f8 e  w1 S8 w$ D6 Q唔知我答得正唔正確呢?!
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# v+ v) o! s; C& N5 I: G  P- }  H[ 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
4 z) ~/ g4 Y) ]0 o2 J4 o, d! \if 1-6 = 7-12     13 is fake
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' _1 p$ g7 |8 x9 {" BWeight the 2 time
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9 ~6 D! M% }* \9 Y! z2 X, D/ G2 kSuppose 1-6> 7-12, ?2 Y8 n7 M8 x, t! p3 x; C, i  q* e

6 U& I0 x# B$ v' ?1-3 vs 4-6
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Then Weight the Third
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9 X3 ~( G2 q& O' {3 h! O8 z- t- ISuppose 4-6 > 1-38 H; T( Y0 p, N: M% x6 z4 i* f
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Just like the first Step
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4 vs 5 1 `0 n3 u2 P8 X/ ^, w
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if 4=5 6 is the fake one 3 j7 y* R# Z8 R# O1 [& ~6 |
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if 4>5  4 is the fake one / L& }* H4 }& G7 }
and 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) A3 d7 l! F8 J8 D$ A

1 a; p8 k& A6 Q: M# i9 z你第三步点去搵 7-12 边一粒???
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========================================4 F/ O5 m! B8 Y
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問題第三步
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; _2 `& n- ^+ C6 \; `) e7 Q0 AWeight 1:  1-6> 7-128 g' X' u* D% o  w  l/ w$ `
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Weight 2:  4-6 > 1-3 & v4 D; l( R- y! ^5 S: _/ }5 V
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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