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; ^( l/ j6 H8 {# Q& e1 C
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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)。% {' E9 S" d+ U. i, @
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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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1 M; o1 o' _; j
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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, x7 ~2 j7 t* D3 g: \

1 {% _5 b$ L* S7 n[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:/ L! w. _7 s2 m7 U, R" K  V
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,
  M+ W; a  j! T+ b- D等我搵下仲在吾在
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4 h* A: v& v  r' D, T2 a3 i  B當日用左37分鐘答１２粒波子，差７分鐘才合格。
7 g3 `( O5 G$ x4 {8 P13.........
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& [/ _1 k/ Q- a' q) d" ^[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:; }# w/ O0 N0 _% ~. s% Q" [

2 p; q8 a. v! x) C# [我以前畫左個chart去答,
( ]- y) Q  z; @5 c# L, d等我搵下...

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3 f! k" X7 P7 W9 v9 z1 p( B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:
) I& B& y$ `4 A3 b1 E+ P唔識隱藏...已經諗到..

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4 W; ~. S+ n" u# Xsor !!!....e加改左  Z3 _" J8 \3 n' }1 E4 v$ P
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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:5 I6 m1 A+ Q  W
相信e條題目都有吾少人玩...

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! Z& B  Y0 l" r; `" |PlayPlay, Let me know later who has the right answer and I will add points accordingly.4 ^4 l- t# m, H0 M
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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) t& l  @! J: V; l1 IPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

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* k3 a$ e7 u/ `, ], Q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 7-12: ?* \& ]$ O4 c* m- a- R* _7 e* d% W& Q
if 1-6 = 7-12     13 is fake
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+ `+ X- f' C$ D+ G6 ]7 D; lWeight the 2 time 5 i  @+ X; `( W$ `  a
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Suppose 1-6> 7-121 E4 A6 I- r9 l4 V5 n, |
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1-3 vs 4-6 ' w; e6 w/ ~. V5 ~9 R9 G

4 ^2 S0 A6 Y' Y5 L7 T1 p+ FThen Weight the Third
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Suppose 4-6 > 1-3: Q0 F0 z  y# |7 w2 `7 p" U" B! b
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Just like the first Step" {, G, A0 y# p+ j% q, b9 T1 Y

  ?4 E9 L7 s! @+ G+ G+ k3 d4 vs 5 3 q+ J0 V& D/ Q+ B: ^6 L' U
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if 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# O- ^4 s) ~# w: B& u5 d1 ~

4 {' L+ K" _% O7 Z1 K# m' hGroup A: 1,2,3,4
/ @( Q% S/ z5 Z; }  {Group B: 5,6,7,82 g8 i+ w! h8 N' F: z/ [
Group C: 9,10,11,123 G+ u8 ]3 ]5 b8 V8 e. _( d
Group D: 13
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Round 1* O0 @/ d* a$ n$ h, S. `
Group A vs Group B
6 e" L) E( k6 |; |% y3 ?如A and B一樣, 即較輕一粒在Group C or D  i) J1 }/ G' ]- }& @% c+ f

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再在Group C拆成:
9 Z6 R! V! J4 }+ @8 W. u' U, z; vGroup Ca: 9,10- ^& K, X8 L# `
Group Cb: 11,12
! S& i5 T7 e* N: `& V. l( q5 g然後再秤, 如一樣, 即13為較輕一粒.
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# u9 \2 F) e% D. ?- ^! x3 p如不同, 即較輕一組有一粒較輕波子在其中,
% |0 ^' l0 ]# ]5 ~要再秤, Round 3, 之後便知答案.# `( m' z% i0 B, e+ i. c
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e.g. #1 假設10為較輕的一粒
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/ F0 w7 Q2 ^0 X, A6 r, E: n1,2,3,4 vs 5,6,7,8 = equal% [5 t4 j. h) W
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Round 2
1 U* I1 T6 G0 }3 Z& s* a9,10 vs 11,12 = 9,10 < 11,12" `  m! \* z; ^7 P& R% X( d

3 |  b) K1 }* @: n% oRound 3
% S2 k8 C. a0 n+ h+ e5 `9 vs 10 = 9 > 10
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/ Y) ]7 R2 m' l  nThe answer is 10.
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8 q' V( {# d3 [e.g. #2 假設7為較輕的一粒3 Q+ P1 V4 p' G+ z
Round 1
$ q; X, n, X) ^! T5 E4 G% A1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 24 |" U% s3 w7 s/ n% J' U
5,6 vs 7,8 = 5,6 > 7,8: Y& Q/ J3 D, F: J' L

4 l. }5 c* u5 M! E" kRound 3- W- k- N# S( l0 l
7 vs 8 = 7 < 81 P: J1 _# x' W/ M9 m7 z3 g
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The answer is 7.
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e.g. #3 假設13為較輕的一粒
& c1 K: b; K3 ]: z, t" \Round 1
) u* H$ T; K& Z9 {. H1,2,3,4 vs 5,6,7,8 = equal
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9 Q" ]/ Z8 x$ y' Y, \0 SRound 2
9 d" N* @. \1 X3 I  z1 W: ^# l9,10 vs 11,12 = equal& E5 V$ T, I0 A  i, P/ c

/ G+ S: c# r/ T! }# }2 C0 a" `' kNo Round 36 O% Z9 r. t0 v2 ]. N  ]( p$ _: 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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7 G+ }! g8 w) S& \+ ?. T[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:5 x2 x) ?, I* b& A( Z7 x5 k3 t+ L
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1-6 vs 7-122 e! c2 g8 c* _. K0 B5 g
if 1-6 = 7-12     13 is fake' ^9 `0 I: X7 }3 D4 V# K

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Weight the 2 time . R  W4 y9 j# q* t5 j" k

+ i8 b$ C/ T2 K% SSuppose 1-6> 7-12( U7 s* e# o' `7 |, R4 F0 X& w

! j- w3 R% ]; ~8 J+ V$ C1-3 vs 4-6 ! M( J) f# W. e8 B2 [
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Then Weight the Third
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1 Q4 e8 M9 I; z3 cSuppose 4-6 > 1-37 {( ^$ W( L! U" [
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Just like the first Step
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4 vs 5   f) [( g9 M/ _3 }* O5 Z- k- J+ ^
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if 4=5 6 is the fake one
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3 a8 c0 h" R1 v% k, Lif 4>5  4 is the fake one
' X; @2 l, d2 X) N& ~1 @! |0 S8 wand so on......................

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% m$ ~: k8 G9 \2 n# ]; ]% E, I問題第二步
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Weight 1:  1-6> 7-12
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, I8 {+ F8 C: r% K2 L& GWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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2 Q7 E$ v! {0 L! c' d( n你第三步点去搵 7-12 边一粒???- w. u- Z8 G9 }# E  ?

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問題第三步
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% M- @" B8 v% a. u; vWeight 1:  1-6> 7-12" l8 I: _3 K0 r; e. j' h6 W
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Weight 2:  4-6 > 1-3 / B6 y: |3 q; O* E5 b7 a
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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