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)。$ v: s7 I9 B. Z
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？』" y3 ^: ^6 Z; C# W3 s

+ j* f3 n- ^4 o/ \, h注意: 4 M* k4 m6 K* M3 q) N5 p, P
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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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+ E6 \# r4 D$ P3 l, t5 a2. 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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4 h1 _' ]& a, f4 h[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:" ~6 j0 m# }! c# y
相信e條題目都有吾少人玩...

3 c- j0 g9 R/ M, B2 E我以前畫左個chart去答,4 P1 ]. Q% o4 |* X- E) f
等我搵下仲在吾在3 W1 y9 V0 y3 n" e' W
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當日用左37分鐘答１２粒波子，差７分鐘才合格。: }1 W4 `% E' i( M# V
13.........
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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,
+ S0 f$ C/ }7 ^8 i, p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:" w( z  V5 V  {, _# ^+ c0 h
唔識隱藏...已經諗到..

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- A: R! o+ e9 s1 Rsor !!!....e加改左- }! ~/ y* i% z3 u
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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+ c5 l+ ^* ?1 {: s- ~/ M

9 g' W& s" O* e) v4 v& g[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:$ i. U% I; \! t' Z; {5 n5 [. L+ L# K
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.  [1 w- C# x; ~6 _! b$ b! L8 `

. H0 L" B& s+ j6 i0 VThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:$ A8 Q4 a" R% G1 M1 m
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PlayPlay, Let me know later who has the right answer and I will add points accordingly.6 S8 v" J4 ^  [% O( ]7 S: B
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Thanks

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9 p- \' e; @3 Z/ u! i8 F不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
; D- c$ j$ N: X+ G. Q1-6 vs 7-12
$ A  J' O7 [. R+ B8 [% u3 f) \if 1-6 = 7-12     13 is fake
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if not
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* {8 k6 |" d9 z6 f& }9 bWeight the 2 time 9 M. i1 M/ s8 x8 }/ H5 i# n

+ y; q+ Z! J" Z) i8 p/ FSuppose 1-6> 7-12
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7 @, {$ W1 _0 a9 ~2 I( x9 z1-3 vs 4-6 * W3 y2 K. K1 T: h

& g8 T; v: [+ v8 _& a8 AThen Weight the Third9 _+ l, o# t! ^; S' H
3.
3 f& Z8 p$ C. ], E8 M  |2 q" {0 Y1 W+ k& `
Suppose 4-6 > 1-3
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8 m+ e/ B# W: a( s+ H% fJust like the first Step
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4 vs 5 5 f1 Y7 Q$ w# r" V1 \  _' x
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if 4=5 6 is the fake one
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if 4>5  4 is the fake one 8 _9 v  C/ M6 K% o" \
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and so on......................

hello1997

分3組4隻波子秤
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( ?: Z- y& v/ n7 PGroup A: 1,2,3,4
1 k( R9 R; T( y/ l- O) |5 X2 ]Group B: 5,6,7,8
; u% i, ]% N0 U! O; q$ {, \Group C: 9,10,11,126 x+ B5 d! i+ }, c
Group D: 13) f, Q) y9 {4 B, V  }. \' z4 V3 f

8 x5 K0 D: S7 j2 KRound 1
/ z+ k0 ?# O' s# LGroup A vs Group B
4 z' o: s$ |* J+ V如A and B一樣, 即較輕一粒在Group C or D
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Round 2' Z1 y- \7 x7 z( T
再在Group C拆成:
. ~. C  Q- Z5 d$ xGroup Ca: 9,109 I' p$ q0 O9 ]
Group Cb: 11,12
: j4 \1 ~8 C0 A1 k然後再秤, 如一樣, 即13為較輕一粒.
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. b4 H2 l  s' U如不同, 即較輕一組有一粒較輕波子在其中, ' D% g7 |* P& R0 [. c4 Q
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
; L( x3 F3 S* d2 X2 U% \: jRound 12 q7 C4 T. k2 f% ^) C  ~
1,2,3,4 vs 5,6,7,8 = equal$ l& @5 k# n- b3 S  J

+ Z! y' C7 c2 q* q; u+ t4 U5 j2 oRound 2
; f; t2 @* q0 V* d9,10 vs 11,12 = 9,10 < 11,12
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# Y7 x% H+ \) L( j* e7 k" }Round 3
7 @8 b9 D$ I8 s8 ?9 vs 10 = 9 > 10
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3 Q* W& \. z1 I' d) bThe answer is 10.
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6 T; p# a/ H3 x7 P! I6 P$ b" ^' Ze.g. #2 假設7為較輕的一粒
. m& h7 P. ]' ?, J+ u' WRound 1
) U# m& ]$ K/ l8 R) S1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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$ c2 Q) j  r9 P1 VRound 2
, q  y- L, [' x$ h- M5,6 vs 7,8 = 5,6 > 7,8# ^% _* B2 j2 I7 z, H* `  P5 ]

. m/ T% ^1 r2 P; u3 L" HRound 3
4 {: O: ~, F( w% E7 E+ ~7 vs 8 = 7 < 8# v8 O3 M$ b. L) V# L6 c
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The answer is 7.
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e.g. #3 假設13為較輕的一粒: v% Y: X2 r0 n% N# U8 D
Round 1. {" T. C4 i2 y
1,2,3,4 vs 5,6,7,8 = equal& |- ]! n9 D9 m1 @4 n3 T
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Round 2
; I$ G! r  l; H, J9,10 vs 11,12 = equal
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2 s' O* C, P: x! ?0 NNo Round 33 P! E0 r& w' b* C) ^9 e& V) Y+ l6 d7 C
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The answer is 13.- I5 K; f! C' d4 e  \8 h

* F/ \* }1 w4 S) @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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' r. m) f6 K' h1-6 vs 7-12
) c0 W$ x( `1 l: Mif 1-6 = 7-12     13 is fake% ~4 ]# ~! _* _& T

6 L7 Y8 k0 X  b9 Eif not
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- h% q2 i  w. |6 iWeight the 2 time
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Suppose 1-6> 7-12; b; F7 G3 ^4 E3 y" x0 g3 g

+ d8 L: ]* ~1 q8 Y5 e: `1-3 vs 4-6 ! J% I! d, ?" ?+ w9 E% K8 v& j

6 Y% U5 L, r7 A( p8 z) }+ nThen Weight the Third# G3 ~  a6 h+ Q5 Y1 b
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Suppose 4-6 > 1-3
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Just like the first Step
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4 vs 5
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1 f$ k0 i8 `# o+ R* Oif 4=5 6 is the fake one 6 K; x& j! e( a: _- a5 c

5 R& V& M3 K0 k4 z6 H8 T  Y; gif 4>5  4 is the fake one
" F, Y+ k" R  O. @3 ^and so on......................

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& u8 R/ V% L9 q問題第二步1 Y  M6 u3 U6 b) t% n
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Weight 1:  1-6> 7-12
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6/ U+ m  e" B! d  c" o1 f( m
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你第三步点去搵 7-12 边一粒???% b. Q% U4 B1 L9 ?& u. o" w; Q
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========================================
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問題第三步" `2 y3 J: S" p' A* s
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Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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9 ^" o5 {+ |* w- k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