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 }1 S4 O0 G" k, x

' ?8 e6 b4 j0 s1 K『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)。
5 E5 p2 v4 k9 }% 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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* ]" F" X! b9 H7 _注意:
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% Q$ h4 j" K" P5 H8 p5 t1. 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3 ^. V  o$ P0 y; h+ c( ^  o/ f& y

2 q( F6 s- E) T$ @! f+ ?' ]9 f2. 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) M* w# T% u) k/ A; W4 a0 @# u6 M; B

( _$ ~4 g# Q% g' Q- v2 j& P[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
' h9 x; ]0 L5 J& 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,
1 m9 z7 V, e) x7 `等我搵下仲在吾在; _( a* F: x4 F+ e* v
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
$ }8 I& ?5 `4 O; d6 X* x( J13.........4 a: q: J) E1 M4 g. S' i# ~* W
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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:) g0 K7 M4 F4 Z
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我以前畫左個chart去答,
& x5 I2 q4 `, P; b0 c- ?7 I2 Z7 L等我搵下...

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" g1 B9 \( H! y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:
  f' c/ K# \" x- @. b- U6 W唔識隱藏...已經諗到..

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sor !!!....e加改左
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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4 {. _# D) ^. A5 g# Q

0 z9 L2 D7 U3 L/ ?[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:8 P. u. E& m1 B6 l8 u) [
相信e條題目都有吾少人玩...

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9 |+ @3 A; Y. V9 L7 ?  EPlayPlay, Let me know later who has the right answer and I will add points accordingly.- A0 b* }- H* ~; B: j2 ?# j. X& L% d

9 K; l, x6 i/ p7 T+ j3 }Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:: D3 `! j: a3 T2 x/ N3 y
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PlayPlay, Let me know later who has the right answer and I will add points accordingly.) F: y2 T" y/ y  o6 ?& p* d4 z
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Thanks

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) o& G6 t% Q8 J: O8 s+ }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 7-12
& s2 P, u/ e' b6 w) B" u) bif 1-6 = 7-12     13 is fake
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if not
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" p  [8 p( j" E9 ~8 B' ^Weight the 2 time . A* q# Z9 a- I% B' T
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Suppose 1-6> 7-12
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  j& F- L8 h- s1-3 vs 4-6
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- C( _+ `1 ]: b; `4 J) `; }& C) O3 r3 oThen Weight the Third1 J5 Z  ^, h2 C3 Z, k& |; ~
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& U$ b0 v. J1 O( L1 m0 u& YSuppose 4-6 > 1-3
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8 l) ^  G, ^/ I0 gJust like the first Step
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3 }2 p  o. [4 Q6 s) Z( Z2 W4 vs 5 : e9 i0 n  w( m! T

2 I- h, q9 P5 g& p" j2 D% y/ l7 Xif 4=5 6 is the fake one + L& {6 u' b2 ~  L5 Q
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if 4>5  4 is the fake one $ l1 t9 L: M) q# `

, r1 V% {$ v( |9 M+ tand so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4: R; e: X& b5 L! G  l. v/ Q
Group B: 5,6,7,8
1 \* M3 O* m: z. i% ?% W. `4 P8 NGroup C: 9,10,11,120 \) U; t9 H* U
Group D: 13
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; A( M9 {( o# z- n( {Round 1# w4 B! r/ `6 n8 k. P! H6 t
Group A vs Group B
0 M; z4 j8 l  q; O3 q7 P如A and B一樣, 即較輕一粒在Group C or D
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+ J; D6 q& a5 `0 w3 @/ w( ^Round 29 K" v0 h6 x# |6 a2 L  W4 K
再在Group C拆成:
+ y4 r& G$ S. C( W) OGroup Ca: 9,10  U$ e, j- g1 j5 \8 l: W
Group Cb: 11,12. q% @% s% [, f" D6 Q
然後再秤, 如一樣, 即13為較輕一粒.
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; ~; I: E% P3 k2 D' i* b& }如不同, 即較輕一組有一粒較輕波子在其中, - J( H0 T6 b. [% M" N, }  F- H
要再秤, Round 3, 之後便知答案.# }( B6 ~) A9 ^  P, N! O
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e.g. #1 假設10為較輕的一粒, s% Y  |) Y/ g9 K, ?
Round 1- z' `+ d/ e; O( Z8 J) P) E
1,2,3,4 vs 5,6,7,8 = equal
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Round 2% D5 D! ?) j1 {8 e, M4 y! k+ K
9,10 vs 11,12 = 9,10 < 11,12
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9 Q- V( h+ }  FRound 32 ^2 d9 W0 o1 p3 c( D/ O1 Q
9 vs 10 = 9 > 10! f8 {- \1 j% {: d7 D( o

/ i- H$ W: y6 V; I* L0 _The answer is 10.- }, V; y/ P! k) g( M
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e.g. #2 假設7為較輕的一粒0 K5 I9 W3 P6 B, c, O& M
Round 1
" K% j7 z5 L+ f1 k+ _% q( L1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
& q$ ?+ k! c# j# D- G1 v8 p5,6 vs 7,8 = 5,6 > 7,8
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Round 3
+ `2 @- z  d. F& k! X7 vs 8 = 7 < 8: T* m- U! H# k4 g% t4 c. s

6 W  T- H1 E' i0 XThe answer is 7.
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6 a, g' R0 I8 b/ z/ h1 we.g. #3 假設13為較輕的一粒
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1,2,3,4 vs 5,6,7,8 = equal
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Round 26 y: k" c- J* j) P
9,10 vs 11,12 = equal# S9 E* |1 o- v& ?; Y! C7 {
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No Round 3  T' d+ |2 @3 V& T" l; Z
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The answer is 13.  H: ?3 ]8 L( s: g  h
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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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) e. F) H: x+ a1-6 vs 7-12
' O3 m, Y: @" h0 cif 1-6 = 7-12     13 is fake
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if not " i1 v4 Y" `% |) Q2 l9 _
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Weight the 2 time : b) e3 N- }4 z' T5 y+ }& Q
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Suppose 1-6> 7-125 I" w1 C, _. o7 h1 c4 k6 q2 B

( U: ~0 {7 o% I* U. R" y  |1-3 vs 4-6 8 S" D0 k0 \* ~6 {# _; B: h8 r8 e7 q

. s$ A+ z# M/ |% b: K1 w! v/ [Then Weight the Third( {' [- k, j& ^& m! N+ h2 m2 V
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5 h1 p/ E4 T3 C& `! nSuppose 4-6 > 1-33 t" r% s/ r( Z6 e1 |. E0 A! X

& S9 Z2 j4 Q& \+ l: a6 E6 ?$ BJust like the first Step
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if 4=5 6 is the fake one
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if 4>5  4 is the fake one
( N3 v1 i. G7 {/ gand 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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9 _6 T6 G" s4 C" PWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6$ v% E4 z" w9 m3 J
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你第三步点去搵 7-12 边一粒???
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========================================6 v$ H* }+ J  I0 h; x) E

- i" u" v+ m. j3 ]! b8 [問題第三步
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  h3 d$ l5 N0 L. }Weight 1:  1-6> 7-12
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: ~7 c, ^6 Y; M" M' W1 IWeight 2:  4-6 > 1-3 7 h# E1 O) ~; m& M9 `

1 _/ a- e9 o) i8 z6 z1 ]+ 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