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* M$ p! b" S7 R1 {: ]
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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)。8 P- k4 M$ Z! v1 w- U
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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' u# L8 M  M# X2 @注意:
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# `. d% M( y4 Q* }3 W; c$ c1. 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:, ^3 v2 J9 V: B3 |& B# |0 m
相信e條題目都有吾少人玩...

/ O% y- ?# q5 [- |$ ~: ]我以前畫左個chart去答,
* b- l; t4 t0 T4 ~2 i  |) J" i等我搵下仲在吾在
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5 O4 u8 [6 s8 P% U當日用左37分鐘答１２粒波子，差７分鐘才合格。
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6 I# r; q6 |- ]' g; P4 f7 C+ \5 W& x[ 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  E: b0 I9 ?4 F2 N' G6 j

$ G7 D4 ?) P) }# U8 N4 T- w8 g我以前畫左個chart去答,
( p) ]% d6 z; U% b9 c! }' C等我搵下...

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8 o  l) q+ Y0 k- u4 `: Q3 d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:
; Q0 a9 n) }. p6 S唔識隱藏...已經諗到..

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sor !!!....e加改左# p: q8 Q; L  Y+ q% `/ E8 [& K
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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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0 M! N7 b" @5 ^[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
$ R& M4 W" x2 p. v# t! |- }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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playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:* r4 [- w! x$ T! k

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# p* v/ a& l9 |PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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" S' v0 z" h& c' m# V' z8 g8 P* ~Thanks

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* E+ g) e  v  I' ?6 j4 B5 a4 `不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

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1-6 vs 7-124 I" ?4 t! k3 |8 G" s6 `* O
if 1-6 = 7-12     13 is fake6 x1 w  R; n! `5 Y- G

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) m/ p3 S4 A5 \Weight the 2 time ! O( C) }- v& h" h  r: H- `9 v
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Suppose 1-6> 7-128 ]4 H" u* {7 d- t
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1-3 vs 4-6 ; h- d' f2 E3 H  X; L$ _! c

( w, u# n/ O! ~/ IThen Weight the Third
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Suppose 4-6 > 1-3/ g% n+ L: ~# I  w9 u

! o) u+ q: H6 B" w# R$ tJust like the first Step5 I0 {* t7 s0 E1 \1 h6 V0 C. D
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4 vs 5 $ f" N: P1 m1 Q. r* @& W

( `; _! B% l( P5 k5 v) aif 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
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, @$ z5 l1 X0 q3 EGroup A: 1,2,3,4
- K4 p( n1 W/ j9 cGroup B: 5,6,7,8- Q& y# f# ?& `
Group C: 9,10,11,12
4 ~/ O, _2 i  e" E: i  Q2 A6 qGroup D: 136 Z- X* X! r9 ~5 L/ O3 Q* R* l

4 E; f1 w+ V( f/ JRound 1
: L* A; C) e2 @9 {9 e. T) Q. zGroup A vs Group B. Z( a, [# O( s% o6 [! C) j
如A and B一樣, 即較輕一粒在Group C or D$ I8 w  T5 C6 g* k* z# U- d# m

7 o) ^" m! y- ]1 gRound 2' \- Y7 H! N- X$ f+ b
再在Group C拆成:; M) I4 C* Z/ T8 m6 ?  p5 q9 z
Group Ca: 9,10
1 `( t7 o) N0 T" FGroup Cb: 11,12
1 k) ~( m% O: `$ ~$ p然後再秤, 如一樣, 即13為較輕一粒.+ `, z- N/ i+ M" {  R0 g  f
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如不同, 即較輕一組有一粒較輕波子在其中, : ~1 y" M4 ^. h6 `/ W
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1 v. E' {$ K* h  ^% M
Round 16 k  E' y- r5 i# n6 M1 _3 R
1,2,3,4 vs 5,6,7,8 = equal, N( A5 p$ k& H; `5 g
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Round 2& d6 o# C! u- @( K$ e5 ?- B
9,10 vs 11,12 = 9,10 < 11,12
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Round 3: b; d- ]3 Q! `! D
9 vs 10 = 9 > 102 C, N' b- `  |4 G" s) v2 V' @
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The answer is 10.! I  l. N% w8 ]) r

& a( p' z8 \* l3 v  me.g. #2 假設7為較輕的一粒2 w' q4 `- E" \& {; f) ^; u9 c
Round 1
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Round 2  h+ R# _/ e" F- M) `
5,6 vs 7,8 = 5,6 > 7,86 P  \5 t) F! b, P2 P8 w! E% q/ F/ e

" A& l9 A7 y& y3 ~7 ?  P- M( Q! O- o4 JRound 3- s7 O! w; b) K7 n- V
7 vs 8 = 7 < 8) H( T# L" \# U$ k$ c
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The answer is 7.
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, \! t- U% c4 y$ j' ae.g. #3 假設13為較輕的一粒- U% V3 _" m0 z: s4 O
Round 12 b9 T9 s6 N9 Y2 K
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
7 D0 g+ o; K5 o5 o& c$ R) u9,10 vs 11,12 = equal
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* u# M+ \9 q4 W0 ]/ _+ D' ZNo Round 3
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The answer is 13.! W/ q9 \6 E0 M
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唔知我答得正唔正確呢?! 6 W% U: a7 a5 f  S4 U8 Z
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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:8 ~6 V( T; g; P4 q8 v
1.
1 {) r& k0 B$ @. `& i1-6 vs 7-12& V  j7 A  f8 k* m
if 1-6 = 7-12     13 is fake# t. v, Z$ R6 D8 u

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Weight the 2 time
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Suppose 1-6> 7-128 _* S" W, q' z4 V" f

5 r: ?+ O% a! ^1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-39 {! |$ D4 U' A) h6 {+ z, C5 j

2 ~9 J6 A3 c' ]- l! [Just like the first Step$ W  p$ j' _' Y9 x

- s' @, ^& N' ]9 W8 o4 vs 5
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, k4 ]! h9 t7 `- eif 4=5 6 is the fake one
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if 4>5  4 is the fake one
: ~; x( N: D, x$ g! r5 }0 cand so on......................

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. Z! M* c$ m  u6 D# {+ s問題第二步* V  P0 p2 }8 W

. a5 ^% N' F4 v& w! MWeight 1:  1-6> 7-12
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6' w/ u3 Q! H5 D7 B& W+ ~; G
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你第三步点去搵 7-12 边一粒???
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========================================
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問題第三步
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# q) P6 n; Q. o8 WWeight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3 * V* k+ \6 q. Y: d8 u; ^0 g
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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