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
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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)。+ f: J, t( K7 a9 j
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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- c6 \, b7 o" K- ?: A9 `; O1. 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& v1 M# s% L! z- |; _

, f+ Z6 A. T3 ]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, K3 R. |$ R' e
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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:
) O7 ], E9 \, }4 D9 G" I- E' S! Q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,# N/ x6 x* q/ t3 |0 u0 x- u, a
等我搵下仲在吾在( X7 G7 o( ~* j

- p; ~9 `0 t" w" |# L當日用左37分鐘答１２粒波子，差７分鐘才合格。
0 d4 ]  z5 X% G6 ^2 W+ a2 G) H( Z13.........
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# i$ z9 F( E% e- |- a# a8 F  \[ 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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; `2 C9 o9 n2 ?1 l/ Z: v8 a我以前畫左個chart去答,6 x& X% S6 P) c/ F
等我搵下...

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5 l3 T2 ]; \. `- J4 `) E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:) `; B0 z1 y; s
唔識隱藏...已經諗到..

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0 I+ u) \! W  Ssor !!!....e加改左2 p$ ^' g4 I! P  c) C0 w* I2 Y. [

1 b# l% a$ r! u# d) Z2. 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  K  b( J2 k  [
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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:
& d$ T& m# N7 ?- J: M2 Q) G相信e條題目都有吾少人玩...

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/ X- e3 ^! y: H6 e4 `3 S' kPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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; M  ]0 i; |4 ^" K4 z; L0 K8 GThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:. ^3 H" c$ Z# A/ ~: `

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

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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

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1-6 vs 7-127 g; N8 H- E; y: y/ G) V! x6 J
if 1-6 = 7-12     13 is fake
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if not 2 G3 b& e- _9 N, h# M% b

& f" a* p/ |1 hWeight the 2 time
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' v# c  |0 a4 n0 u: oSuppose 1-6> 7-12
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( Z  `; L" ^- ^# R3 F' F! G1-3 vs 4-6
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) W: }& M' M5 |" ~1 [+ uThen Weight the Third% Q) @. n+ w. R) k- e; m
3.
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Suppose 4-6 > 1-3
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Just like the first Step) {) |1 e, G# N4 Z

& p9 T$ u/ p5 ]& ]: y4 vs 5
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$ L, @4 {3 i- i* }5 Fif 4=5 6 is the fake one $ E2 \# s8 i# U) @2 E! l- k

/ b6 C6 D3 y" W) Z! vif 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤# Z$ Z! p; C: [7 Y; Y

: a2 ?2 R! I" h+ i& o# e6 B& VGroup A: 1,2,3,4- w$ a# X2 Y' S- E$ J1 V" {5 l
Group B: 5,6,7,8% @' W2 u* O0 ]2 T: \+ |0 D
Group C: 9,10,11,12
# s1 k6 R8 y- K1 l' ]& U+ _Group D: 131 }; M7 q$ ^. K" g' t5 h5 K

0 e3 E! g6 s3 f6 S- @+ e! H. w/ uRound 1
: n4 I. b. {9 u$ b( WGroup A vs Group B2 A  t- |" L* M& w# o$ T- h6 r
如A and B一樣, 即較輕一粒在Group C or D
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4 [1 k5 f/ v8 N, w4 kRound 2  g/ A) P4 v1 s% }6 p! j. \
再在Group C拆成:
7 Q" M& P5 O  MGroup Ca: 9,10' O/ I, z( _" |) c. g# X* o  I
Group Cb: 11,12
9 [- d% Y/ Z& B4 {& [9 s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,
7 m* D& r9 X/ [; {  C' ]要再秤, Round 3, 之後便知答案.* ~" n( t; S8 ]. x' V

$ J' x, S# Y% `# n/ M. Oe.g. #1 假設10為較輕的一粒
4 Q/ Q0 u7 D# Q, }- K% ~- A- RRound 1' p1 w- ~$ t) B
1,2,3,4 vs 5,6,7,8 = equal6 I/ K2 P' i/ W0 f( U

" k9 {0 B0 |" Q. A0 y. YRound 22 e' m- G6 C: e6 r2 t, e$ f
9,10 vs 11,12 = 9,10 < 11,12
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* \* M4 f4 V) o$ ]( c8 F  B9 VRound 3$ S" B, P7 H& e: |
9 vs 10 = 9 > 10
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6 I/ T( I% [- s7 N& p, o4 VThe answer is 10.
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e.g. #2 假設7為較輕的一粒
0 u' w6 s4 o8 wRound 1
# O( W1 t$ x* X: u( @# X. `1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8( O6 m' G% ?0 s5 U. }

; ~2 v/ X, e$ K3 e) h+ BRound 2' c8 H0 s; q7 B2 p$ s$ d% p! Z
5,6 vs 7,8 = 5,6 > 7,8
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Round 38 D/ r4 N: ]0 [* u" c
7 vs 8 = 7 < 89 P: H2 S  ^, Y2 ]6 _9 c

( X$ K# ^2 O0 H5 U9 m' SThe answer is 7.  H5 b8 q! X5 W; I  \3 e
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e.g. #3 假設13為較輕的一粒0 s/ }4 ~5 U8 L* k. K( O+ j
Round 1! ^0 {4 g! f. b: T; r
1,2,3,4 vs 5,6,7,8 = equal- I0 x) j! e  r
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Round 2. I! A+ g+ t1 [0 Z/ \5 N' j
9,10 vs 11,12 = equal8 b9 [  x5 a( E6 r2 `& m" b  F

3 \. t4 K5 a1 E1 l4 R2 t# xNo Round 3
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The answer is 13.8 b/ n8 V4 \$ d0 l- e& r
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唔知我答得正唔正確呢?!
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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) G( X3 }* G' E. W
if 1-6 = 7-12     13 is fake6 P+ V; j) J- Y! ^/ h  H
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if not , @1 W0 H1 Q9 j. {1 }, b' z

  r0 z* @1 T( y  I% w# P, ]Weight the 2 time ' v6 l$ _# u+ Q5 U# ~
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Suppose 1-6> 7-129 |: h) e' d/ P. Y' v8 e
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1-3 vs 4-6 - s  N, L9 k/ @$ U$ j$ e

8 e1 B6 r9 p3 M" o& UThen Weight the Third
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Suppose 4-6 > 1-3# P* I" u) F6 G0 q9 H
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Just like the first Step6 W. X) D: A0 o( G; o2 T, A1 y

% |5 w( C) D/ i5 q* e9 E# N5 V1 y4 vs 5
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1 K5 g) w- N7 g& b' q4 l9 Xif 4=5 6 is the fake one ! C9 @/ H* H0 G' \8 _
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if 4>5  4 is the fake one ) h  q% a/ F) D3 R
and so on......................

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/ w: N9 u* _# V3 @; D. P/ c問題第二步2 ^; c+ S; u" J  t: _

' E3 e4 f4 }# t  h5 b" [8 A% qWeight 1:  1-6> 7-12
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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. T4 u, A) \1 R3 u# X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- N4 F, u$ \! w8 g0 c

5 h$ K1 P0 _6 \- UWeight 1:  1-6> 7-12$ c: g: I9 R$ ~- |' ?: T
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Weight 2:  4-6 > 1-3 7 O0 p! v4 g$ @" p3 O

' X- v* p! x! m) M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