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$ F5 d: u) S# M/ y( m, u

9 Q. W0 v1 e0 q  @『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)。
" ]. ~% B( ?% J4 f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？』" X1 Q# B8 S4 p- X
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注意:
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/ ^; {+ B  L6 z  t1. 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! B2 m6 {1 f( }# `$ T+ _- M
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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* p" ?6 o5 r* X" P9 j
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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:- V1 v! G) M3 J5 e7 D- B9 ]
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,
6 V- r* r$ [0 h$ P2 ]: G8 `2 b: e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。) x: S& l* _  D# {. n
13........., p7 S/ k, y4 O% t

$ P" M4 f  n9 j- m2 \[ 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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5 Z1 _1 q- C$ C7 v8 _我以前畫左個chart去答,' {! _; v5 J* c3 J
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:
+ n. _" Z4 G  L4 n唔識隱藏...已經諗到..

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& L. X0 O6 f) z5 \0 P; Ysor !!!....e加改左8 H- Z1 @9 V( o0 S" x, g
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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
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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:) V9 o' [0 e+ E: K0 A" L
相信e條題目都有吾少人玩...

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( L4 w8 \3 P. @# i5 CPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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* F/ V9 v0 L9 s7 \8 b/ |Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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$ v% }# l. B9 y* ]1 @PlayPlay, Let me know later who has the right answer and I will add points accordingly.4 {9 r* [' N) Q( m% w& Q
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Thanks

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& o, i& w: N3 v: g不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
  t- U4 q1 a2 R9 J. z# S/ d7 j1-6 vs 7-12
! o& a9 A7 d# b. @if 1-6 = 7-12     13 is fake
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Weight the 2 time & c& V% }( D5 H
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Suppose 1-6> 7-12
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1-3 vs 4-6
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Then Weight the Third" C5 B6 F9 Y7 I0 B6 E, l+ K1 n/ x
3.5 w. K- m' ?: o% F

* g& O. a) y7 pSuppose 4-6 > 1-34 h) u6 |! i9 O& H+ g  I. p2 c

% |6 Q  G  {6 e' p4 u( g# P! g( V8 gJust like the first Step
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: i$ B/ `0 p" o# A7 c4 vs 5
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+ E* }. n- E8 A+ B) i$ dif 4=5 6 is the fake one 6 ]0 A7 m( o( e% Y& v

3 j  W7 e- v/ P5 \& Zif 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤" A5 p4 W7 ]- V. S2 k* O: C9 s0 }

) p! ~# y( E& n9 {9 NGroup A: 1,2,3,4
' v: E4 K" y+ c1 q) `, y  t. jGroup B: 5,6,7,8; y/ ~7 S( P8 S  i: c7 V6 P, X
Group C: 9,10,11,12
& d1 |& G6 n% O7 ^0 N7 xGroup D: 13
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* x& o& R3 ?) E2 n* YRound 1
6 L( I$ @! d  _# iGroup A vs Group B
- [5 |7 \. C/ U. B5 B& e: W: q如A and B一樣, 即較輕一粒在Group C or D1 U- Y0 J9 f0 S! S
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Round 2! h0 i; {3 S3 G1 w
再在Group C拆成:) j2 U2 k8 S8 @' ^/ E4 o) y
Group Ca: 9,10
! s; F% p: _  A5 iGroup Cb: 11,12# ]" E4 j) q7 n; Y- X  b5 ?
然後再秤, 如一樣, 即13為較輕一粒.; `, \( }9 ^7 D; Y% E

: b' w& Z, K) K' [1 N如不同, 即較輕一組有一粒較輕波子在其中, # d2 X6 \' R3 _0 D) O
要再秤, Round 3, 之後便知答案.
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, M, ~! f" b3 S! y- Me.g. #1 假設10為較輕的一粒
5 o- P' Y8 R' ?Round 16 F- k8 i/ P8 W. h2 d2 A/ T' ?
1,2,3,4 vs 5,6,7,8 = equal5 o, t: Q9 F) T; ^
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Round 2. d- F3 d7 O( Y
9,10 vs 11,12 = 9,10 < 11,12
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Round 33 N2 g3 y& W3 P0 T5 f- U
9 vs 10 = 9 > 10
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% z$ P! v. E1 @( Y3 [. mThe answer is 10./ Q2 d; k+ k( g; Z6 N, b

+ {$ Q4 j) n. Y3 w7 x- K$ xe.g. #2 假設7為較輕的一粒
5 r5 K+ q" n, I6 H/ VRound 1
( ]1 m! Z# e; W* N) V1 A1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
1 H; G1 f7 k5 S4 j' i7 }4 j5,6 vs 7,8 = 5,6 > 7,88 j9 F# `' w8 t/ b3 \
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Round 3
0 ^# {9 |" Q% N4 }$ m7 W- `7 vs 8 = 7 < 8! e+ |9 t' z, A: ?- |
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The answer is 7.: s  j& S2 s6 T

4 b# |7 j& k4 F, J! F7 q+ ^e.g. #3 假設13為較輕的一粒( _0 {5 J4 t2 Y& R
Round 1
* Z  a7 W& H% K8 e' n! w6 Q3 \1,2,3,4 vs 5,6,7,8 = equal
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- M( X; X7 X% iRound 2
1 C; P1 ~3 v9 v" C0 g0 E8 y. u' @9,10 vs 11,12 = equal
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1 `7 T: v! G0 H9 qNo Round 3' F0 x; B- S4 Q. c5 j! x4 n0 {
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The answer is 13.8 z2 Y# ]6 w  A

3 V5 Y  @. p" Y1 v% T8 M( u6 K) T唔知我答得正唔正確呢?!
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& p# i3 `' d. a* D$ R% K. b0 w[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:( J# O" h/ P* g% B2 ]
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1-6 vs 7-12
0 N6 |) A. L3 o4 W) @# ~1 Nif 1-6 = 7-12     13 is fake* G% g& Y$ j  I1 j: L
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if not
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: J" I% j" I1 _' U* S3 {0 H, HWeight the 2 time
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Suppose 1-6> 7-12
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. l& f% y; G: u" j+ g, N/ T; N1-3 vs 4-6
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4 k/ j: P2 _7 j# O+ FThen Weight the Third8 l! l7 r& \! q8 r- d9 z4 T
3.
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Suppose 4-6 > 1-3; Y1 c3 M1 k2 Z; o; ^4 |6 p

# b/ J. b) ?$ E( A# H# XJust like the first Step6 M" ~( C' I" s* X9 q

- j( j2 W8 I2 G" `4 vs 5 - t. x' ?( W2 Z6 t7 C
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if 4=5 6 is the fake one ( w0 U* T' W- d9 V

" T% g% S$ v" B5 V0 U1 x; Gif 4>5  4 is the fake one - o' f$ {+ g5 m6 q% v* A
and so on......................

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問題第二步1 ]. M6 Y6 o* A% x. q
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Weight 1:  1-6> 7-123 g8 j  W6 ~4 \& R, Z! d1 g

& R& v: ~1 }6 L" G" V9 iWeight 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???
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  c" T' m$ R* R" c  t0 q========================================
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問題第三步
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Weight 1:  1-6> 7-12$ s. x* ~% p" b2 X/ e, b4 R0 N
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Weight 2:  4-6 > 1-3 5 p( L! z3 V' ]$ ]) M2 N8 {+ f

9 X: Y9 _) V$ x2 Q1 I, G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