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 V: M9 Y2 @% r: w; m: B

! Y0 C  e% b5 \! G$ w: R  t0 l『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)。! [7 o. a' {$ b( R) o9 b6 t1 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？』
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; I! O7 F; S, J注意:
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- {; J( @+ g! V. t# b1. 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1 P# G+ W' C) R* ~

! u+ _$ @; C  d# a9 J- }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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[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:" x1 z9 p1 h# l& [% h0 W9 e
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,  v1 {" k3 E8 U
等我搵下仲在吾在3 P. ^$ I. |4 b  N& n: K' n
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
, T+ D5 x( B2 Y7 c13.......... ~7 B5 v0 @" y1 N

. u3 J: {8 ]* r# _. y( X7 v[ 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,
$ m: w! Y4 W! @2 ~1 f  D2 {2 F, X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:# k  x0 Z/ F( m4 c* ^/ w2 O
唔識隱藏...已經諗到..

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: r! \  e+ p7 M$ C+ @- Zsor !!!....e加改左
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. S: g6 R: F, O" H7 ]* w/ 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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3 ]& x+ F5 L8 P9 F5 N7 h% _[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:& K& e3 Q+ d5 u( {
相信e條題目都有吾少人玩...

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& m4 E6 I1 g7 G* wPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:: f- ~" R/ I% N; d
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/ T2 M9 |9 b1 H+ ?% K/ ~: W4 }: ^0 c: ZPlayPlay, Let me know later who has the right answer and I will add points accordingly.' F) i5 E! |4 {6 B

) f8 p. k) q$ c* n& y8 d; ~) CThanks

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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.) E9 m1 d2 P' r* m5 w9 \" a
1-6 vs 7-12! F1 m$ D: `7 ]1 K6 S
if 1-6 = 7-12     13 is fake) R# m! M+ ?; [5 m
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if not
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Weight the 2 time
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! C, c( w: C" F- m0 ]# P! RSuppose 1-6> 7-12
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5 |! m9 _' b" q; }) g1-3 vs 4-6 # u; q, W( D  M( U$ l

3 w( s4 p4 I/ i6 o* jThen Weight the Third
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* B$ b4 |# z, A! V3 Y4 iSuppose 4-6 > 1-3
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Just like the first Step
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4 vs 5 " T. r: P5 S9 w* }$ H. h
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if 4=5 6 is the fake one & C/ d; @( b( }( N4 ]5 q5 V  u
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if 4>5  4 is the fake one
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# |9 M# {5 C; P" P+ yand so on......................

hello1997

分3組4隻波子秤. k/ Z& j7 |( x% }8 {6 D7 t# C: U

  ~. w5 U1 t* E- f3 }9 a+ SGroup A: 1,2,3,4
& @" O0 ~) h( A8 E6 X4 ]Group B: 5,6,7,8
# |7 O. ~+ F# B; h0 j; YGroup C: 9,10,11,12- Z) Y% y, l. g) C& g* {! g
Group D: 13; N2 [, u) N# p4 R

8 A  L1 r# D/ |( p9 I) XRound 1# W) R! d& j! j' l0 @
Group A vs Group B) \: A' ^% {4 h
如A and B一樣, 即較輕一粒在Group C or D
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Round 20 l# o4 C4 u. [! |9 y6 N3 T9 U
再在Group C拆成:' l6 e, L$ `+ ?3 ^2 Y
Group Ca: 9,10  r) L+ i- a! i" b
Group Cb: 11,12
# Z0 S+ M# U0 U: r然後再秤, 如一樣, 即13為較輕一粒.
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$ f1 m+ u  ^3 X8 }2 J5 Z如不同, 即較輕一組有一粒較輕波子在其中, " w; n! h9 s0 C1 S+ E# H
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0 c3 a+ `& O/ p) M2 S5 F; \" G4 r
Round 1
6 O' W, Z; o( Z- j$ [1,2,3,4 vs 5,6,7,8 = equal
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9,10 vs 11,12 = 9,10 < 11,12) q4 ]  r  r7 V6 ~* r5 T& D

# P+ \0 l- F. [, U2 ~+ ZRound 3
- [. M/ j7 {8 }7 W- \, n$ f% `: {9 vs 10 = 9 > 10! o7 X$ Y& w+ N% b' f3 p
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The answer is 10., S) A: M, P' M0 U: M: e2 k

" w5 K/ b  [) K$ [" E# Oe.g. #2 假設7為較輕的一粒5 Z. d) F4 F  T: [  m& `
Round 17 Q; l. k$ v' P9 k
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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- E- Q4 v( V7 u1 \  q" g! WRound 2% S- V6 W# c: D, r1 s" m0 @
5,6 vs 7,8 = 5,6 > 7,8
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- \9 q! h4 K9 H% a2 xRound 3
6 G/ u5 d! Q4 B8 i1 Q7 vs 8 = 7 < 8
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The answer is 7.
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5 y* I7 @) }% ^+ C6 Q9 Ie.g. #3 假設13為較輕的一粒
) M7 S2 ?) ?0 {Round 1( f5 B+ y0 |* V6 f" i. P
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
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No Round 3
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2 s( s; e8 l' T% V" ~The answer is 13.
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7 d  P2 j( j6 u+ b7 O( k. D4 @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:: }: f1 \3 d. a9 n
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1-6 vs 7-128 d/ N0 h3 E" U" f, n5 J
if 1-6 = 7-12     13 is fake# f( a0 q' E' D. s% F# s

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Weight the 2 time $ N: _. o" N1 Q3 e
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Suppose 1-6> 7-12
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1-3 vs 4-6 8 ^  E7 l1 I/ E6 B8 v  e9 d& [
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Then Weight the Third
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' x' `" v9 ?3 F. }Suppose 4-6 > 1-36 v; Q) g- D; \: J1 R% K& _
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Just like the first Step
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! t- h  P5 w& D; n% T0 i4 vs 5 2 K, ^2 U; e% V0 U! r* x
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if 4=5 6 is the fake one + L$ |  [1 e9 f3 S. B
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if 4>5  4 is the fake one
1 b# I* z8 W/ i* R9 jand so on......................

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- d0 y* h7 p2 N- O; ]8 b問題第二步
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  n6 D4 l  ~1 jWeight 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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: [, H" |2 ~, @' `- w, P8 P! G1 d你第三步点去搵 7-12 边一粒???
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問題第三步
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" H' r; r; ~5 H$ H' _  ~# _Weight 1:  1-6> 7-12
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0 @" R% I5 |) h8 U; S# AWeight 2:  4-6 > 1-3 3 v7 m/ _/ L/ R  U* [& R7 @
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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