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; h7 c7 q# T4 S* P! B
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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)。: G7 Z6 x3 m, S3 c& _
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: - c( ]% c) W0 B9 G0 Z- U
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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6 l' l% l8 ?8 U

1 o3 D2 @1 |- Q[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:# d6 [# u$ ]1 i6 ]( u
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,
$ Y) z/ {8 M; n5 B等我搵下仲在吾在! l6 r7 X3 _7 i2 b  U* U% c

- V% |3 Y( V% l) ~; J" m當日用左37分鐘答１２粒波子，差７分鐘才合格。
, E) X/ ~( r9 I% B  [" D; {13.........
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) W4 Z$ R8 h. u  P( ^9 l! g1 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:
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( \# D5 ?' l' M% y# ]0 @3 P我以前畫左個chart去答,. P) U# P/ F; \0 j" N5 k$ U
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:
7 @/ d; p7 E! n+ u( r! h# x+ H唔識隱藏...已經諗到..

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, ]9 \8 ]3 @+ t" Osor !!!....e加改左
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3 n9 t2 J! S+ h: C2 q5 W2. 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/ l9 v+ F  c, f7 G3 |2 j0 }. M7 G; z

! I  I2 H+ @2 ^4 `' e. E% b: w[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
" H$ m4 Q1 J! Q# f- \相信e條題目都有吾少人玩...

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$ X$ _" K% g  MPlayPlay, Let me know later who has the right answer and I will add points accordingly.; k, K9 S$ G1 x$ e; I6 r/ e

7 Q1 Q0 W# H4 Q: w1 F' hThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:: k) y2 z" W8 u

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.; t# a7 X! k- \, N
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Thanks

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, I/ @( T' O) i不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
3 I4 V( B  _  ?# N1 \1-6 vs 7-128 g9 |) f7 c9 [/ p; a" O3 h
if 1-6 = 7-12     13 is fake
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if not
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9 O% z8 `9 Z" c$ Q8 c6 q! JWeight the 2 time
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8 X0 i8 d# o) k  N# CSuppose 1-6> 7-120 ?' ~1 S& }2 z( _! ]& ~8 v6 ~

7 `1 c2 f9 h% o4 e. L1-3 vs 4-6
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Then Weight the Third
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/ _% k1 d) j+ g& b' jSuppose 4-6 > 1-3
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Just like the first Step
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; a4 L+ g: w. Y# ?2 _: q; N9 E4 vs 5
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7 Z2 Y. B& P/ h; ]) e6 bif 4=5 6 is the fake one
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) A1 T! ?) @. I* R, Pif 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤6 q  d3 R# o5 f  N

6 ~" ?2 y3 ?) Y2 J3 C" |Group A: 1,2,3,4
$ u0 z( Y. [# ^- B9 Y3 E0 O; jGroup B: 5,6,7,84 d7 _. E6 `, w5 s- {
Group C: 9,10,11,120 x& e4 [, q# L
Group D: 13* Y0 ?( w- G: D. m9 W/ w% M
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Round 1
( G: |+ \, x+ \; P/ z- jGroup A vs Group B6 H7 _+ b* @8 _! i- E( [4 Q& X. s& V- e
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
; Z1 p  g' x5 [/ O( a3 ?" \, O再在Group C拆成:
; Y7 w& T. B0 _9 l* }# I! X, A; bGroup Ca: 9,10
4 l0 I( P3 s5 v0 r- u% |Group Cb: 11,12
  v( K' s* H, s" R' h然後再秤, 如一樣, 即13為較輕一粒.  e( {" M) m) W& m3 g6 ~, r8 T
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如不同, 即較輕一組有一粒較輕波子在其中,
. a3 m+ i! \. g9 V4 S+ a要再秤, Round 3, 之後便知答案.1 F  n: p& E" Q& X( ?( D9 c; C

  R) x; k: b/ j' g6 Je.g. #1 假設10為較輕的一粒
4 f' ]" F! M" f+ LRound 1
0 `7 i: L7 Z. J3 E; t: ]4 G1,2,3,4 vs 5,6,7,8 = equal
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9 ]# u3 ~' W+ ]1 ^+ j7 H- vRound 2$ i, v$ r$ t& l( E& \$ j
9,10 vs 11,12 = 9,10 < 11,12
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Round 3$ v  H2 X6 F! u3 \% e, {! u
9 vs 10 = 9 > 10& q  S* U8 A2 D" Y

: {8 w' X# @1 {, uThe answer is 10.
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e.g. #2 假設7為較輕的一粒1 I) F0 g; M+ x8 q- w
Round 1
- z) f( q! z5 A+ l5 c, f1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8% Z( V# Z* `9 H5 Q* o( y+ U2 v$ w

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5,6 vs 7,8 = 5,6 > 7,83 e- K$ h: C2 y2 E- _
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Round 3
/ V) i& X) V9 ?7 i5 u0 I. F7 vs 8 = 7 < 8
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4 F* k  g' U' `$ K. n) A% IThe answer is 7.
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/ t/ k% V3 f2 g, Ze.g. #3 假設13為較輕的一粒; @; ~; i5 E" d5 x; U
Round 1
9 y: n/ s0 l( ^) d- a, R3 A( Z1,2,3,4 vs 5,6,7,8 = equal
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Round 2* K; C% e2 a" S' v9 l. ^
9,10 vs 11,12 = equal& B  r! {& g+ s1 j) W, @
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No Round 3
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The answer is 13.' S9 L/ f( a  |0 z

  [! F, e) _2 ]4 W( w唔知我答得正唔正確呢?!
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0 }. g4 V  ~3 R7 F[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:) i& l8 W3 O& b- k. f
1.
) X- T  d& V( S# Y& b+ G4 E1-6 vs 7-12
7 i7 T8 G+ \) S1 {; c) ^8 Kif 1-6 = 7-12     13 is fake; c% ?: h" `( A  F* ~

/ C) x6 C2 K2 iif not
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Weight the 2 time 9 U# e% v: @* ?9 R( [, {4 B
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Suppose 1-6> 7-12
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2 h: C  T6 }; @3 Z4 u1 p) k1-3 vs 4-6 6 y4 n5 ~0 d% X& k

1 M2 A, d& \' |+ p/ O# QThen Weight the Third: {& H$ e0 ~/ ^5 B+ E
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Suppose 4-6 > 1-3
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Just like the first Step6 P& ]: v- p" P& w3 {  M
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4 vs 5 # g$ \% z. [8 E% i. C& C; l
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if 4=5 6 is the fake one
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* M4 ~+ s9 l4 k7 eif 4>5  4 is the fake one
- g" M9 w& Q7 U) J% K7 ~- P) X# cand so on......................

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問題第二步7 |( x; O' U) S8 E# W0 k5 j
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Weight 1:  1-6> 7-12
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) o  s/ n, T1 |& Q  ]9 ~' }7 ?) uWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6+ Z3 n* |8 q% n5 Q& k

: s; {3 Q! N3 k你第三步点去搵 7-12 边一粒???
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  L( e  [, c* i, d8 L問題第三步
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Weight 1:  1-6> 7-12
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4 W/ l) M9 q" e; N2 IWeight 2:  4-6 > 1-3 $ ^2 _8 d$ ]0 T8 E: 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