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)。' r! t  U6 \! P6 z6 p
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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8 u  Z$ R, I4 I3 ?" J注意: 0 Y' L3 O, `$ b6 ~. W
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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
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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:% L- U. j1 c; J' r% s
相信e條題目都有吾少人玩...

& o- ~) J8 K( ?7 p& k7 l我以前畫左個chart去答,
$ V* @2 B$ j7 E, t; N% m等我搵下仲在吾在: ~9 e6 ]  ^% z' Z# H
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
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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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我以前畫左個chart去答,
0 U( c3 U- e2 f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 y2 j% n% c$ w: p. w# [* Y! f! Q唔識隱藏...已經諗到..

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sor !!!....e加改左2 H. L( r/ v; l0 k5 T  ~* p

4 C% }/ @) B) @3 |2 v) g) _6 C, J2. 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/ _2 P5 }' L, x4 \; ~! X$ N3 J

6 E1 O. x8 O6 l. t& J[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:: ~) A, ]6 n3 Z7 o- @
相信e條題目都有吾少人玩...

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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

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:6 H! a3 D# I1 V4 B! e

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: W3 H" i- X& V& b: YPlayPlay, Let me know later who has the right answer and I will add points accordingly.; ?1 u6 W6 D; l6 h
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Thanks

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! Y  U! ?) A0 s: \6 d# |6 P不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
4 W; v1 g# Z* Z7 `+ c: L5 {1-6 vs 7-12
; a8 I8 x- s$ ]% s8 Q% U% Vif 1-6 = 7-12     13 is fake
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4 D* C( X$ C5 e3 ?Weight the 2 time ; D0 ^; O* v% }+ t
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Suppose 1-6> 7-12
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1-3 vs 4-6 0 W  ^. V: t/ X: X& d5 H

- m) k& S/ b+ r" G. Y9 w1 N: MThen Weight the Third
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Suppose 4-6 > 1-3
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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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& p  |( [* o. i! J' R6 f! Oif 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4: C& q2 k% r! W% o2 ~# P: v" N
Group B: 5,6,7,8
2 ^# ~4 `2 a- {" t+ J, M) \5 KGroup C: 9,10,11,121 i1 p4 _: K5 E% H
Group D: 130 X$ c: [8 _' u- G
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Round 1
% p" K" C/ b: z5 D; GGroup A vs Group B9 _4 E7 C( y3 p
如A and B一樣, 即較輕一粒在Group C or D6 t, |5 L* R! Q4 h
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Round 20 q& n, D  S. ^1 m: h, m
再在Group C拆成:7 Y' q1 I4 l/ ]. _( x  m
Group Ca: 9,10% j7 U, ~; l/ D" G
Group Cb: 11,12
2 b; G2 C: U5 x; Y6 f* a然後再秤, 如一樣, 即13為較輕一粒., a9 F; Q: J8 U: M. L3 m1 u/ K

% d4 @) y$ B2 H2 k  I如不同, 即較輕一組有一粒較輕波子在其中, ) ^  X8 S' F/ o9 Y- G
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( @  n1 w! q# J) j
Round 1
+ M  _# k4 n0 F+ T4 {1,2,3,4 vs 5,6,7,8 = equal# ]$ O8 _: Q% ^" ?4 i& G

  U4 G2 k8 W) ~8 S6 wRound 2
0 a2 Q7 I' z) {8 ~( S/ T! m9,10 vs 11,12 = 9,10 < 11,12
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Round 3
8 c: o  r- Y' B0 n* s$ B& }) G9 vs 10 = 9 > 10
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The answer is 10.$ i) e  S/ m4 d+ q7 _" l3 L

3 M; U3 o7 n7 H7 c- r0 I3 A$ ae.g. #2 假設7為較輕的一粒1 M* I5 i: \$ R  E9 ?  E5 ]8 o3 p
Round 1$ k- y' k$ Q6 ]& b( X4 H, b
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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! u6 k! h* v4 z, E$ u) `, T+ uRound 2
! G4 B: B; n2 T/ E# |5,6 vs 7,8 = 5,6 > 7,8
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Round 3: u: t  _7 b! k" A, R6 s. B
7 vs 8 = 7 < 8$ ^+ b# T& D8 m! u
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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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1,2,3,4 vs 5,6,7,8 = equal
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$ r. c% z! X$ O/ w$ e/ ^Round 2
0 }2 q: o% t' x' |+ ~1 i6 M' [4 J9,10 vs 11,12 = equal
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% }0 B9 G  E. B* |No Round 3$ q* u& e/ L" Q& e. u& ?
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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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6 L8 O7 q  d' H9 E9 q[ 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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7 a* N. Y6 v% ~  D1-6 vs 7-12
4 G$ h6 N( ^  t5 n$ g) w) i, n) eif 1-6 = 7-12     13 is fake$ b# A* e8 Y0 l2 R) S# K

. i1 f7 T$ x/ D4 jif not
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& T  e$ c4 h  X0 i9 EWeight the 2 time ' F0 @) P2 d0 d8 O7 w) G& l) M+ j
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Suppose 1-6> 7-120 X8 A, _- ^2 c
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1-3 vs 4-6 5 G" p0 D: P* B4 L* ?
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Then Weight the Third
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) X; h3 |& ?! T% ^Suppose 4-6 > 1-3
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. _$ k6 s/ {. Y# @' H. ^. \3 c- EJust like the first Step+ I' u- |' j- o! {6 |. }3 C  w
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4 vs 5
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2 ]" {4 W; Y5 s; \8 D' `if 4=5 6 is the fake one " \. Q% j9 X1 m3 z4 b

5 x9 T3 B/ ]2 b% l- |: I% Mif 4>5  4 is the fake one
3 |' S" k5 A0 b( Z! k5 T' ^and so on......................

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問題第二步
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& j5 f3 W  Y6 F9 oWeight 1:  1-6> 7-12
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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???, P9 t. Q4 I. \# q. i' V& L

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5 y$ {0 z* b$ B% r2 }! N" D' |+ M問題第三步& P! }1 A: |/ D" M6 x2 t7 X

; x; {8 a1 B7 m" H- AWeight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3 - A' h2 ^8 V# ~# m/ v0 P5 t
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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