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" {# `4 j- R: s: w5 y
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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)。
" }+ x& [, f* |$ P9 L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？』6 P+ k  Z: z4 F3 n0 \

3 g; @% d4 y1 t3 S* [8 `8 F注意: 0 }* h$ s8 r' Q3 C( c; g* t+ m

, c$ |2 {: T" H+ ^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
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% Z, Y. K  _4 _, A1 W" R[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
) [0 x) ~; s; y, d+ i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) [: Y! C: z0 H8 r1 o/ L等我搵下仲在吾在
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5 f5 M' t% }3 |9 T- G當日用左37分鐘答１２粒波子，差７分鐘才合格。
" M; I, L, A' q8 U13.........  z/ W: k- h9 m# {
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[ 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,7 A$ ^6 w+ Z( [0 f7 K
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:+ e0 _& J% P+ s6 @
唔識隱藏...已經諗到..

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% Q5 _* C8 ~9 f  t  N2 o: r) Wsor !!!....e加改左
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4 |+ {- V/ u- j% D2. 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) ]) W; E( Y" G1 M2 V$ [/ Q9 D
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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:
0 W5 X7 ~6 ~; v, A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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7 w( _- p0 A/ G$ c% `Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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+ i2 _7 ?7 a: v( n: UPlayPlay, Let me know later who has the right answer and I will add points accordingly.! T* O9 b7 T; q- X

( C6 b4 I2 O& bThanks

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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

1.
5 P2 X$ g9 d. T4 i' J% _/ B1-6 vs 7-122 M& ]/ I9 H8 {( I/ N
if 1-6 = 7-12     13 is fake
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if not
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Weight the 2 time
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: ]8 }3 f; d% F7 OSuppose 1-6> 7-127 Q9 `  B1 U& M0 s  `) G
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1-3 vs 4-6
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/ e9 C7 R* U; FThen Weight the Third
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Suppose 4-6 > 1-3
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8 m1 e$ Z' i; u& T, r) _1 m+ c0 qJust like the first Step
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4 vs 5 , d  W$ h! j& {
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if 4=5 6 is the fake one / u, `+ o% ?$ \# d7 w' c( j
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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: h; a* A* K4 |2 e0 v4 _/ D: M

, G) _0 C  A: Q* e! }: d9 ]( }) zGroup A: 1,2,3,4
: J8 ~6 }- i% ^( {1 X* R+ aGroup B: 5,6,7,82 j( \% \9 y# I" X
Group C: 9,10,11,12. W2 |, ~- ]5 W; A4 |2 }! [/ B
Group D: 130 m  S1 C2 N. u

! u# k) _8 j6 J1 u' t; r8 \Round 1$ w& f6 I' I9 `; |' R9 c
Group A vs Group B; _* C$ v0 q/ q
如A and B一樣, 即較輕一粒在Group C or D
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$ i" k9 w, o" f% _Round 2
- U8 c& \* u! d! G8 _再在Group C拆成:/ x0 w8 F  g/ Y% p' I
Group Ca: 9,10
7 X6 ^9 G/ R; }7 n# }Group Cb: 11,124 M% \" \5 `% v0 `
然後再秤, 如一樣, 即13為較輕一粒.
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+ W. R& j0 p3 X" z6 c. p* |; B如不同, 即較輕一組有一粒較輕波子在其中,
! r8 l, ?- J0 U; G' G! h要再秤, Round 3, 之後便知答案.' J3 K# c4 U5 Y! o9 k/ z

3 f' z- e0 V5 D1 Q& ge.g. #1 假設10為較輕的一粒- ]& ?' C, J1 i) `6 g: ^# I4 r5 ?
Round 1
7 V- l9 n" m0 a' K2 Z1,2,3,4 vs 5,6,7,8 = equal
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6 P+ k1 [' K8 ~( }& HRound 2! B: X( a, N4 W6 n4 E) l
9,10 vs 11,12 = 9,10 < 11,12/ V3 s7 e+ M8 X' c1 K) F  q5 [1 W

3 v' J2 S. I3 QRound 3# y1 g/ r8 ^7 b
9 vs 10 = 9 > 10
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6 f3 ?5 i" _  r/ C* PThe answer is 10.- A) _. V) a4 {2 v/ D
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e.g. #2 假設7為較輕的一粒
" n+ \" V' w6 B, J- X6 f% w9 QRound 1
9 u6 V- ~- Q, I1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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( M- J4 ^3 R$ I- x; h( LRound 2: |8 w' j7 P" a4 |: }+ F
5,6 vs 7,8 = 5,6 > 7,8
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Round 3; W) ^, ~; b/ o
7 vs 8 = 7 < 8
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The answer is 7.$ L3 [- X4 L/ u0 s2 Y* E! s7 q

; e( m- f6 ?" a$ |  y$ X1 D0 Ue.g. #3 假設13為較輕的一粒" [6 y4 j, O; w5 q/ y
Round 18 m" q+ ^6 [  c+ I" y2 Q
1,2,3,4 vs 5,6,7,8 = equal( A0 N- }- j2 e0 K; B8 }

: k7 N+ n! ^/ K. X& w2 fRound 2
" P, n1 R4 u0 N. t9,10 vs 11,12 = equal. b( K# b% i' Y: a
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No Round 3+ h) `6 v$ r( Q& w2 t' o
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The answer is 13.4 T3 U! Y# o" h6 g0 B3 X1 E& g

( W* L7 |: Y; ~& g6 M唔知我答得正唔正確呢?!
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; c: r" j6 ]; ^[ 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
, }0 b* R6 Z( G0 V- _4 oif 1-6 = 7-12     13 is fake
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Weight the 2 time $ I2 G! q" q6 D+ |+ l" R

  w$ A& s" z* `! W  Y9 c7 TSuppose 1-6> 7-129 r; \# s( W( `
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1-3 vs 4-6
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, {- s5 }1 @* e# X. i- KThen Weight the Third
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; S* ]1 N* m9 k2 MSuppose 4-6 > 1-3
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Just like the first Step
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4 vs 5
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8 J2 w! M# N8 Yif 4=5 6 is the fake one 5 P# i4 S5 X! T5 G: l( ?* W- C

2 W- i% F/ K$ @$ ~if 4>5  4 is the fake one
6 X0 y; y& z% N$ k  {; ]8 Hand so on......................

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問題第二步
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Weight 1:  1-6> 7-12
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. h9 ?6 ?! f7 QWeight 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???7 x& Z/ ?7 O1 d. o4 N  w
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& \( k0 y5 r0 n1 L問題第三步0 T- G, E7 l* ~( k3 F
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Weight 1:  1-6> 7-12" p' H9 g7 A6 M+ [+ |
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Weight 2:  4-6 > 1-3 ) o+ Q, j! S/ Z, C% R" y

3 r1 J( f% K6 P, ~8 s% b9 _8 x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