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* t+ }$ D+ r3 o' r; M0 d7 e

: t! @/ x* h. n' s, 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)。& B5 d  Y3 p% G/ R, A& ^
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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6 ]- `' s/ v) Y( m4 i6 p2 K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# l$ f+ `! {. F3 U$ w
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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, q  F- @6 L' R7 |

6 K' J  P  W% q. Z+ q' s[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
) Q0 s( i5 u! {3 H& I7 \; W相信e條題目都有吾少人玩...

' W! P8 n7 k* }  u0 ?& M1 u: g我以前畫左個chart去答,% G# K+ p! ~2 t- L
等我搵下仲在吾在
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9 j. L/ {5 J% H3 k2 o+ o& z6 o" y當日用左37分鐘答１２粒波子，差７分鐘才合格。
- _8 q' Y+ R2 m2 S13.........% \4 }# P6 ^. S/ X

: H$ t1 q* i& B' n" n& E. z[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:, s! o4 r4 r$ K6 U
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我以前畫左個chart去答,
1 M& z! g4 J+ |1 X0 |. q& Z2 b等我搵下...

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/ ~( y" V! ~7 R9 e3 H  f2 x; s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:' [$ i) j' [& g) ]3 h3 x9 E
唔識隱藏...已經諗到..

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sor !!!....e加改左, B: n" ?# a, [

0 A6 H) K+ L) {6 U8 M5 [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9 i% ~! n' e, N- ^7 _! P

# h8 W7 a" x. N+ e  w" [[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
2 ~! w3 m. V/ E3 K( o; g9 k" Z相信e條題目都有吾少人玩...

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9 @' s4 u# N% W/ @- _4 B' P6 JPlayPlay, 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:
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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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) u4 H( s% ]0 R. C* j. Y2 AThanks

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4 a  l/ b# P5 d  j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
, j3 I+ S6 L, N- E6 o. y9 b4 aif 1-6 = 7-12     13 is fake# Q+ I' N3 A# f3 [0 ?  b' I

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/ ^: J9 u7 |( Q- {' g; NWeight the 2 time
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2 ~+ G! W3 b4 _) y  F. lSuppose 1-6> 7-12
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6 [6 u% `( T& z! g' V) ^  a1-3 vs 4-6 1 C. q8 A. l" ~, e( L
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Then Weight the Third! x9 \( F  R; A8 g  h& f9 F; r
3.2 ?9 z9 ?6 z4 T4 w) s4 O. c$ ]: c

2 ?" l6 n9 b3 q& Q+ ]% NSuppose 4-6 > 1-3: {: E: K1 M" N/ {; w: {* r

. E4 {) B9 a9 R5 D$ i# w, f6 Y2 V! PJust like the first Step
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4 vs 5 . p- E& |/ ]9 B: x$ S4 x7 r
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if 4=5 6 is the fake one ) u  p1 I9 Y, Q% s3 `

& j1 E3 R) w4 a2 S. l7 L" f5 fif 4>5  4 is the fake one . x9 }) Q5 m* D7 W) d* Y
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and so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4
" v3 ^7 G" h8 E" QGroup B: 5,6,7,8
/ T8 a' J/ m2 H' }' }, DGroup C: 9,10,11,12
# y: s  i$ W& LGroup D: 13
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" \0 V7 L* R5 o3 M) SRound 1
8 `8 F; b7 b6 xGroup A vs Group B
9 X/ ]- w$ G# G# B! P2 s* H4 n如A and B一樣, 即較輕一粒在Group C or D* F5 u- q1 N2 G3 i7 z; n% d
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Round 25 t. q+ {. x1 P' f4 W3 A& i8 J0 q
再在Group C拆成:
2 S8 \- y2 V6 q2 ~/ b+ }Group Ca: 9,10: o" X  q( D" F- P, x, _
Group Cb: 11,12% h- q( e! e0 A* h: r6 j
然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中, - [7 u& ]# l& r' t  r" E. V! u5 t
要再秤, Round 3, 之後便知答案.
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$ _; \; }# Y, a: t) le.g. #1 假設10為較輕的一粒
8 p. C6 n! Q. Q' \# l& mRound 1
/ W- y* K& \5 C6 G3 c+ a% q# N1,2,3,4 vs 5,6,7,8 = equal" E+ E% K& d9 E9 k' U# o
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Round 2! t' w. [/ x; @
9,10 vs 11,12 = 9,10 < 11,12- Q' \7 ^& k$ s) W" e& _9 m5 p5 Y# r9 E

6 J" `" @+ R( i2 \  {  fRound 3; H+ K9 V' A( n
9 vs 10 = 9 > 10: I# v! w' ^$ h" X1 O( ^6 C
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The answer is 10.* N! t. w& C: m% B
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e.g. #2 假設7為較輕的一粒4 Y; [' A2 c3 b) u: a$ k
Round 1
4 K5 j$ U* Y9 @1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8% Z' {. ?9 E- h5 V
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Round 2, m5 e; l' u' r% a9 V
5,6 vs 7,8 = 5,6 > 7,8
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  T" Y& A0 D0 y! sRound 34 V& R0 }! z' F8 E( M3 S' G
7 vs 8 = 7 < 8
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8 T' J' p" J" R( O5 J$ m; EThe answer is 7.
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e.g. #3 假設13為較輕的一粒
' U- d* f& @! ~  F/ ORound 1
; o  m2 k) D9 D" n7 e1 d0 ]% l8 ^1,2,3,4 vs 5,6,7,8 = equal
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8 T) t/ g+ N( vRound 26 R; O. Z3 R. [8 \6 }) Q
9,10 vs 11,12 = equal2 ?+ r$ ^6 U- z* n& o  T
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No Round 3
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The answer is 13.
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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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1-6 vs 7-12: y7 v/ b8 g1 h, T$ D
if 1-6 = 7-12     13 is fake
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; i* Z* v& }7 fif not + I3 `# t! G8 S# r+ a2 K: n( A' N
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Weight the 2 time
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7 I+ j' G1 }$ v9 y3 o6 S7 fSuppose 1-6> 7-12; g+ Z' D  F/ X- x

7 Q1 k* i3 ?* z, ]* C1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3+ j0 y" k, j" E7 t+ U
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Just like the first Step/ Y7 j, e/ p" G' }  N! T

* q5 n6 Z: k7 _% u0 [9 C4 vs 5
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: J+ l5 r: ]4 U4 z3 |if 4=5 6 is the fake one 2 q  T$ ]/ P$ O8 u% c: b: `

* M3 t7 S- A3 q% c  J4 ~# Iif 4>5  4 is the fake one
, {4 m+ _( }8 [and so on......................

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) _- y8 r6 o  ~2 l7 {/ P/ F. m問題第二步
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Weight 1:  1-6> 7-12
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-69 i* a) f3 K0 Q; v3 U! Q. G* P

0 z0 G$ [& r7 J' J" d你第三步点去搵 7-12 边一粒???+ |% [# j4 k4 W( ]
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========================================
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問題第三步+ T5 t. o' F+ R- t# i/ f3 o4 A

9 h+ E0 |7 @: aWeight 1:  1-6> 7-128 v1 c# V( k0 t& o+ W2 P% H
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Weight 2:  4-6 > 1-3
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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