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$ g( w- P: M& {3 j
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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)。
9 B/ w- i; l& N5 r+ U8 S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？』2 }2 r4 }4 K( ]
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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- s+ b8 V+ l( G  ~* }  L
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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8 K' F7 J: d; K! S7 |

/ U- X; w  a3 x  k8 x[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
* |4 B% Q6 H( R0 ?2 [相信e條題目都有吾少人玩...

. Q4 ^9 o, f) a% ]我以前畫左個chart去答,  k5 b, n$ c0 q* @) T
等我搵下仲在吾在6 D6 w0 K% }$ W, s% B

$ B% M  Z2 N  D& B當日用左37分鐘答１２粒波子，差７分鐘才合格。
0 B1 U) M# W: y0 B6 _" f. k( Q13........." m) I) J: G/ J3 H- k- N

# s7 s5 ?; z4 ?3 ~. U% G, ?, T[ 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,, E- C; O: `6 s  S8 I6 H$ c
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:3 I( v* I) M5 g3 }, m% p
唔識隱藏...已經諗到..

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sor !!!....e加改左) I8 p; [3 e; w/ s5 b3 G6 a! S

; ?3 G4 o9 t1 l* i2. 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 Z9 X6 i5 ?% ?: J/ f; ?# X[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:$ r4 {" C( N: |& r. k0 T* L
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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  P! r4 j5 s* \Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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* U! {) M) }$ k* hPlayPlay, Let me know later who has the right answer and I will add points accordingly.3 A( e- d, L6 }$ r

6 q# g+ C- ]' d2 H/ ?7 S, s6 SThanks

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2 d, h' J( W. r5 G# P5 |不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.9 E4 B! ]0 J& Y: h4 `, j
1-6 vs 7-12
/ s* \. b/ O5 T% f% Qif 1-6 = 7-12     13 is fake5 [& G- E* ]' l9 r& y" d% ~
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if not 2 W/ I" ]8 O3 G

1 ]+ y& ~5 u5 MWeight the 2 time 1 c$ x4 h  L: x) {9 ?+ ?: \9 G
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Suppose 1-6> 7-12  p% r3 A. l; I; {7 p+ \8 f) _
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1-3 vs 4-6
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& j. g& ?% C  f( L. O8 ZThen Weight the Third5 f. r; t9 ^1 q( m! w
3.
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% Q* j" k* A3 e$ GSuppose 4-6 > 1-3$ D; C) |: |( T. T% |: r# q
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Just like the first Step7 g& |) L+ L8 p/ `' H' t7 _
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4 vs 5 - u5 J; e* I$ b  t0 {( ]1 P
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if 4=5 6 is the fake one
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( P; x* h, y1 G& \6 Oif 4>5  4 is the fake one 2 J! W$ Z& U% t! N1 h

- N  O6 X" O. m7 c( Hand so on......................

hello1997

分3組4隻波子秤
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, I0 l# R, \' i5 v+ C; a. y9 D& XGroup A: 1,2,3,40 h6 y& W, I8 ~( O3 u+ f
Group B: 5,6,7,84 K5 r/ I, r4 ?
Group C: 9,10,11,12
/ q' h& p% Y3 ~/ u, yGroup D: 13
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Round 15 z7 K* C' k; n' C5 |* ?7 J
Group A vs Group B
0 o. R6 h2 G  y' k如A and B一樣, 即較輕一粒在Group C or D0 i6 v0 a( E4 X  u/ i0 j' [

/ e- b2 [* a7 e8 @$ B+ ZRound 2
; E: U5 h! V! M1 e. h! l再在Group C拆成:
  o6 m; U9 `1 ^) z. s' rGroup Ca: 9,10
- C$ e/ r4 }0 j( I. k  F3 s8 c  SGroup Cb: 11,12
5 o' G9 I7 G6 v9 E; ?然後再秤, 如一樣, 即13為較輕一粒.
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" ^5 g( |( E7 L) w4 C如不同, 即較輕一組有一粒較輕波子在其中,
. |4 i% J& J4 M8 D/ C9 _1 s要再秤, Round 3, 之後便知答案.
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0 H; \' g- `" n+ ae.g. #1 假設10為較輕的一粒
0 M, r3 \. l$ g* DRound 1. ]% w7 [) O% ?4 k$ @
1,2,3,4 vs 5,6,7,8 = equal
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) j% K! a& s9 \* ]3 Y' q6 t: FRound 2
( A6 y" q6 [+ C3 Q$ ]+ l9,10 vs 11,12 = 9,10 < 11,12
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Round 3
) [  r- W3 n6 w9 vs 10 = 9 > 10
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The answer is 10.8 q  r! ~8 \9 J& V" N! r

' p1 G0 ?+ s6 be.g. #2 假設7為較輕的一粒
/ w  c3 _" a+ g, e  FRound 1. D4 J, d# E! g8 C( M: Q0 P
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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, k1 C6 V9 G, L% Q; `" zRound 21 R& P' Z0 C8 k- t' Y" e! v! n
5,6 vs 7,8 = 5,6 > 7,8/ h; M* g- K: o# ^$ X- ^4 v* F
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Round 3
, s/ a- {) `6 i9 |7 v7 vs 8 = 7 < 8
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The answer is 7.
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e.g. #3 假設13為較輕的一粒2 u8 a" v5 b% v7 E* K) o  i
Round 12 A9 e! F- H4 d) ?- N$ K
1,2,3,4 vs 5,6,7,8 = equal
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% P+ z) a, S7 P3 ~Round 2
% V6 S" @$ r. [) Q1 Q9,10 vs 11,12 = equal/ m9 C5 s' D0 u+ [1 P0 R+ D' H$ e
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No Round 3) W9 O( x8 l$ O7 w" X' c
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The answer is 13.
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唔知我答得正唔正確呢?! 4 i) k1 P9 [. p: `4 E1 C: T
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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:
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1-6 vs 7-12
6 C" d9 u3 K6 `+ ~5 cif 1-6 = 7-12     13 is fake& p9 x" L- j0 ?/ T( K. f! A
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if not
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Weight the 2 time ; ~. ?. W: r# j1 ?1 v

# D2 F) s) Y) n; [6 ^% `7 bSuppose 1-6> 7-120 F$ T5 ~9 \" q  O, D
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1-3 vs 4-6
% i) I# e' R+ u/ k
: _  m2 O# f; hThen Weight the Third/ o! i; {+ J( x  B3 T" h/ J
3.9 O* \- k( p4 P3 B" j' z% c" G& c& C

% T" R# A6 s; R/ ]* X" `Suppose 4-6 > 1-3; z5 o' g5 Z' G5 p& H# P9 z

7 u0 g5 @' {4 Q1 l% cJust like the first Step
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5 V2 ^/ d7 N2 F) {4 vs 5
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if 4=5 6 is the fake one % C. p% K6 w  ~7 s

! {* B: G7 n' g* wif 4>5  4 is the fake one
5 W1 r3 ]: J; ~2 e( m( F& Wand so on......................

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0 ~5 q$ ~; x/ k+ |  f7 Q4 I問題第二步7 ]$ R) `4 `8 s5 S% m4 W' x3 C4 J6 h

- I: J8 D* y, a) e/ a; EWeight 1:  1-6> 7-12
7 v; l6 r! ^7 B; @! o1 e$ y* Y; {; d3 _
' o5 L: g) g! b# P7 W! dWeight 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???) {. s9 J2 l' y# t
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========================================
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# t1 c% L8 C( h0 x' K3 H問題第三步
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2 L2 F6 {1 n* }. C5 C, VWeight 1:  1-6> 7-12; A) k0 K  b* v8 r! H  }

# [; G9 C9 B* N7 a, n& W# iWeight 2:  4-6 > 1-3 : B: w' K+ l6 F. T- o
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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