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6 t" J8 d0 \: ~; s' y

, ?% b9 J* W$ L: Z5 W『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)。( z) Z% A% f0 @! e9 O
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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' Q, C* v, C3 H+ U2 ^注意: 6 C% a8 b: S& Q- i. B7 y
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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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+ D6 L1 t. M, ~% g. t0 |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- \4 i3 r0 O- }" M! E

  ^: b- ~. f! m[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
, Z: A6 ]: ~& Y& d0 l! ?相信e條題目都有吾少人玩...

4 z7 y. o) }) c- [$ F% r( @# o8 E我以前畫左個chart去答,
- s% e8 e& Y0 j. a等我搵下仲在吾在
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# D- k* j6 Z$ n0 G" D當日用左37分鐘答１２粒波子，差７分鐘才合格。
/ G1 }. V% F8 O1 D/ K13.........
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( Q! f' K3 I. ^$ B4 g# h2 h[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:+ L( ], j0 q5 D5 p& U& v) U7 ~) Q

. Q3 G8 h' C, D/ |" Q0 N' `+ P我以前畫左個chart去答,
( W" ^3 Z( N# O1 H+ {9 S等我搵下...

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& L' P1 p. [+ x' _6 ^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:5 x1 ?+ W, l' [6 g! m
唔識隱藏...已經諗到..

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sor !!!....e加改左
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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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1 q& O- _9 O/ _, R[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:1 V: q% w- v- B
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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8 d7 c* |; e$ T- t: p. x' fThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:0 W" Z* K; @& ~/ W- U; r5 r+ |3 \4 Z

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+ K- Z9 @# }% n" o; uPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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  Q3 n- b  ^' q  R" I) NThanks

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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.
4 B9 L8 e" o( y& Q# J% u9 [1-6 vs 7-12' Y( L4 \8 g6 Z- J0 M, Q0 E
if 1-6 = 7-12     13 is fake
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5 Y% ]! R5 f! O" }3 Lif not
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% e0 ~4 y2 l0 HWeight the 2 time ; G5 e8 J' V* G& L

# S# g! v' A7 i# k9 QSuppose 1-6> 7-12
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3 A. Z/ L7 E1 N. ^6 g1-3 vs 4-6
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$ J9 f& }- G/ ~' ~, t3 UThen Weight the Third
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! _* P8 ~9 y+ C7 J$ l: Q$ {4 sSuppose 4-6 > 1-3- R8 e6 {/ U; C; J* b3 W$ `

/ c& h6 T- g. W% uJust like the first Step7 |. \8 r6 x( o" A. i2 O: z

. x& B" W% v) k' }) R8 J4 vs 5 4 }1 ~+ p% h: B9 P
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if 4=5 6 is the fake one / e1 {5 l% t6 v
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if 4>5  4 is the fake one 7 a" |; F  ?3 G% {
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and so on......................

hello1997

分3組4隻波子秤# |/ b5 c% y7 k1 v; f; j2 J! D

4 |2 t6 W* B3 u/ b% ?, l! F: vGroup A: 1,2,3,4: }" A2 ~! y  g- L
Group B: 5,6,7,8
: c6 J5 x' H  e' i+ n% ^Group C: 9,10,11,12
2 K& p) q8 P3 |1 JGroup D: 13- A* K# z7 _( x1 Y, a
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Round 1
8 j: A# G' N0 ]- j/ aGroup A vs Group B
0 S2 ]0 i1 O0 n! `# t! j" r1 n5 ]如A and B一樣, 即較輕一粒在Group C or D! g9 r: H. R$ q+ V7 Z8 n# d6 n( @
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Round 2# S5 O! |* P% Q& O
再在Group C拆成:
* k  z0 _  W9 F1 j3 xGroup Ca: 9,10  L$ ^8 d  E0 Y1 W
Group Cb: 11,12- @8 b" V/ t1 M. b3 u
然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中,
  f- S& [- [) O2 M& M要再秤, Round 3, 之後便知答案." m, ~# j# s/ T

0 p: S0 r1 ?; ?1 Y& W! `) `! Q& `e.g. #1 假設10為較輕的一粒4 @7 @  W  |  B* K  C3 p9 h
Round 1
) `2 z+ d, p6 Z1 |! e3 }' ^1,2,3,4 vs 5,6,7,8 = equal) ]- X9 i* ~8 l, U. P
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Round 2
) D0 Q2 r/ b3 Q6 |9,10 vs 11,12 = 9,10 < 11,12
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, ?2 P- _5 Z0 M+ t2 V1 DRound 3- k! @9 [' _1 }; g2 I
9 vs 10 = 9 > 10& i/ _, i) S0 X* Y" {9 W' x, V

1 m. B* }8 @# g2 C! ?% o- Y( pThe answer is 10.
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# V' J8 W. k+ i5 c9 v6 y- Re.g. #2 假設7為較輕的一粒
# B! }# ]7 m3 a% q1 E  k% {. ]Round 1) G4 x/ d3 g/ W
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 22 {8 H" t7 S5 T+ m+ P
5,6 vs 7,8 = 5,6 > 7,86 T' `' C0 T% p8 l  ~
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Round 32 C4 @; M& Q; |+ M# C& x# Q
7 vs 8 = 7 < 8
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7 v) x- W  \5 e+ JThe answer is 7.
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e.g. #3 假設13為較輕的一粒
; }( W# t; U0 LRound 11 s) H. q0 k+ J9 x" j$ L* `8 _+ c) r
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
- z0 x- J$ w5 m$ u2 T" W9,10 vs 11,12 = equal
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No Round 3
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0 |5 l! s; d. f3 ^& NThe answer is 13.
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7 ]* e; i  m8 F: ?! x) r9 `7 m唔知我答得正唔正確呢?!
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: [, N+ |& z( r6 P/ \% ?7 O% ?[ 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" p- b8 S, O1 E6 O6 H2 D  W# c
if 1-6 = 7-12     13 is fake6 g& X5 X! m8 C) M4 V3 j; i, B

/ e- u! B% D1 T3 P# }2 @if not
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Weight the 2 time * s2 d6 ]+ e) J2 }# S

+ X2 r1 T4 _3 x( ESuppose 1-6> 7-12. T$ n: k$ `0 g0 D  u/ {+ ^- a

+ Y, b$ H/ ?# ~4 ]2 X1-3 vs 4-6 . l. |, Q, o" G) F, C. h$ c
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Then Weight the Third
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7 C% Y2 q0 a, c+ H& l8 V8 g1 }Suppose 4-6 > 1-3+ X& V( v6 M6 X( N  Q' j
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Just like the first Step
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: [+ S8 h! _6 o4 B1 B4 vs 5 / x8 ]. s- v) \. X
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if 4=5 6 is the fake one
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" G; _/ J: ?1 W& vif 4>5  4 is the fake one
1 T, v; O2 ~) v' band so on......................

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/ ^$ s8 z8 C$ p9 l問題第二步
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Weight 1:  1-6> 7-120 |4 v: s) L5 _: b# [' K& t
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-62 w! m) I9 N, y9 I

9 g& J; u. R3 ~6 F你第三步点去搵 7-12 边一粒???
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+ [- p0 \' {- `: ?7 U$ |1 Y0 `========================================
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問題第三步
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( @( Z# }+ p0 A5 VWeight 1:  1-6> 7-12
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4 L+ P8 ~9 q% e) G2 iWeight 2:  4-6 > 1-3 / [# K  S! v2 V* O% C

6 K7 \2 A# Y: }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