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  ~3 N: p7 P% d1 e8 p% ~
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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)。& T, q2 M6 V; V6 k' Q" r
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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/ X! N: n( q6 U" [% u4 H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
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' L; V& E& z6 K- h; K) h/ u2. 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:& j9 R' M* z# N0 U' y& H6 G) Z
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,
  f1 E0 f% s# x) l/ A等我搵下仲在吾在
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' y5 d, U  S4 G2 o" O當日用左37分鐘答１２粒波子，差７分鐘才合格。* ^9 k! k- u5 d# o) t2 e. m# k
13.........
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* o% }/ g: ?, J7 Y[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:) z5 W5 O$ u" Q9 U+ c5 b, w

6 V% s0 d% z+ T& I9 U* x  E- [* x) ]我以前畫左個chart去答,
& l# r( e3 U" [等我搵下...

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9 U3 y/ t% i# j( `, H5 t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:
# s+ t" ^6 i$ W* c; Q0 b* T唔識隱藏...已經諗到..

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sor !!!....e加改左0 p: n" r5 B/ l$ N

+ z+ _/ S( `5 b- ?8 [9 J2. 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 G5 Z% [$ c: X: p4 i$ n; C[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:3 O9 s) f2 `  W3 O
相信e條題目都有吾少人玩...

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% G* t$ T8 O8 WPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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5 o0 m" w) C9 U" h, G$ A* LThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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" E3 E5 j( }! H& ~: wThanks

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1 X" y1 Z7 M  k2 ^4 Y1 ^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 7-123 M- ^) T) r4 ^0 l) P# U/ _
if 1-6 = 7-12     13 is fake1 Y! m: W, p' j! p

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# m% @1 G/ q& B7 |4 j. }Weight the 2 time
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+ Z; s; r/ p/ q* W8 D, I# c1 Y' wSuppose 1-6> 7-12; [4 V) O$ S9 y

* ^- b1 r8 \# [9 e. g1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3+ b4 l6 |! T7 z' a

% y# E/ T4 @' AJust like the first Step! A4 F5 j3 z2 n7 N! i9 [5 Z

7 C, r- M* h  i. D4 vs 5
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if 4=5 6 is the fake one
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8 L5 v$ F% ?6 qif 4>5  4 is the fake one : ?3 V8 w2 O8 g; }9 y! I6 D  \6 `
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and so on......................

hello1997

分3組4隻波子秤
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3 `% K2 g- Y' |+ @0 p1 r, zGroup A: 1,2,3,4( |, U2 ?9 s4 U3 p) t
Group B: 5,6,7,80 f2 l' x+ H* L5 y3 ~
Group C: 9,10,11,12. l! N( H4 Y0 ~1 L0 U  v
Group D: 13
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Round 1: f+ k; ^( K, _5 |
Group A vs Group B
3 `0 o# a9 @) ]. J6 h" k, R如A and B一樣, 即較輕一粒在Group C or D6 m; R* V7 {# E9 o7 J
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Round 2( u( S0 @8 S" P* `1 A9 {/ Z
再在Group C拆成:
  B& s, x- r# w+ z% iGroup Ca: 9,10
$ Y3 [4 x+ v+ W8 s7 k* a, a+ wGroup Cb: 11,12; W$ h& l" A! F0 |
然後再秤, 如一樣, 即13為較輕一粒., [  X3 j2 Z6 Q. V9 ~

7 K* s0 s9 {- }; a/ P" l* o) R+ l1 T如不同, 即較輕一組有一粒較輕波子在其中, 9 a! ~+ c9 b3 L/ g+ |4 Y3 m
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
! I3 K) o3 C# yRound 13 x' z9 f% K4 p/ Q2 x3 |9 ~& r
1,2,3,4 vs 5,6,7,8 = equal
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- s3 {0 W. }) ^# eRound 2$ V& X, b8 ?. E: v/ F. p) y
9,10 vs 11,12 = 9,10 < 11,12% S* H/ D& V3 A3 x* [# F6 @
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Round 3
4 |. u# y$ o( c+ ?$ U9 vs 10 = 9 > 10# q: k/ A, t. G% M. _7 a1 L0 ^, w7 G

' m  r% [0 Q- V  Q; IThe answer is 10.
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e.g. #2 假設7為較輕的一粒; X) q) m2 C1 z; k
Round 1
; [3 Q& o' A% d: F8 ^1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2' p! S2 `9 v( G7 d0 }4 v" d: Z) `. w
5,6 vs 7,8 = 5,6 > 7,8
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Round 30 P  j; x- J; s: Z# a  D, b; V
7 vs 8 = 7 < 8* C0 k) |( l" y- d' Q8 y  N- E

9 o7 U  T# ~+ ?& HThe answer is 7.7 I" R2 W$ S: r5 S! U- G

0 q, q  g" K5 z+ ]$ z6 L& w, we.g. #3 假設13為較輕的一粒& K4 r8 e! s/ n! D
Round 17 K4 \) F* m. ], _6 w4 l* w
1,2,3,4 vs 5,6,7,8 = equal
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! k$ `* y7 l5 x! j8 j" dRound 2
( Y2 r+ ^, |) c  n, a6 A9,10 vs 11,12 = equal' u8 E! u% T7 f/ p1 y8 N
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No Round 3! h# D  P( K) ^, W( Z" U7 k5 g; p7 }
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The answer is 13.0 s, C# }3 O5 W% Z+ a* c

& l" ]5 j- B) V; _( R# _2 s唔知我答得正唔正確呢?!
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1 n0 {4 ~$ F) s9 j9 e[ 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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' ~$ v" V7 l% I5 I# ~1-6 vs 7-12* L: i# |3 `# S% O! D3 j
if 1-6 = 7-12     13 is fake% y* H6 H* z+ y4 i9 v
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if not
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Weight the 2 time
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9 v7 @- ?' [1 V. q( J& BSuppose 1-6> 7-12
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6 m- q9 W4 p. ]1 \0 d' s: j1-3 vs 4-6
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. ?9 Z% ~' Y) E' K+ IThen Weight the Third
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Suppose 4-6 > 1-3% w+ b) S( M$ r8 I% T* ^( I

3 k& m( u8 I8 l" G6 s6 {Just like the first Step
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4 vs 5 % M+ T6 F( B; H8 z
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if 4=5 6 is the fake one
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& F$ g! G$ K6 j, h* z4 L3 t* Yif 4>5  4 is the fake one
& H3 }6 Y/ ^1 {and so on......................

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# `" b9 T# d: u+ s問題第二步
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Weight 1:  1-6> 7-12$ Z& ?5 ~) [; }( Y5 _/ v1 V; K
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6) S( |2 B3 M# P' C' p5 [0 X) _
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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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9 ^% O# Y) a1 x. W1 Z' uWeight 1:  1-6> 7-12" V! g$ z" l; M) b

  O, E: ]# Z$ eWeight 2:  4-6 > 1-3   _: J$ b$ u' c0 x5 \! Q- @

# C6 e& ?" y$ ?' Z, {( d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