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)。: U; [9 D! }: W+ t2 b; f
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？』+ \$ e, F! K1 F. _4 W! l  H1 f# ?

6 g9 r& d  l% l5 I& y注意:
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2 `, T& F3 y* T$ y1. 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) i, N9 e: _, T9 e

- g: E+ M" |' N. G* S2. 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$ D  U+ o3 Z4 R8 D; k$ q

1 K- g! y# @9 s2 |) @7 I[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
% {9 _  C5 W. [相信e條題目都有吾少人玩...

  R3 v! h; k4 o* U3 z) y我以前畫左個chart去答,
& J# {; ?2 k% G8 K& ~# W$ V/ Y等我搵下仲在吾在7 f$ w  X) v* Q0 V8 x% }

4 f7 s3 q* ]6 R& V8 B當日用左37分鐘答１２粒波子，差７分鐘才合格。
0 J9 {9 g' W5 ^: |& M13.........
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' U* J$ @; ^  J2 g6 U) k6 G[ 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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: n3 k1 d, d+ s% R我以前畫左個chart去答,# w  q- l/ ~7 H; a
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:* f* l0 \6 l, _3 I4 @" K+ p7 f
唔識隱藏...已經諗到..

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6 r1 p* E! ~3 J5 e9 U+ Gsor !!!....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
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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 P5 `# G/ G) Q( Q9 d
相信e條題目都有吾少人玩...

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  S) ]3 H, [9 j+ p% k5 YPlayPlay, 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:5 `+ r; H! V7 _8 [% C

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6 U  Q6 O* H! i5 V0 c6 u! ?PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

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$ j8 _' g/ j3 f& W不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.8 b! c, e! |; Z: g% I8 {% o
1-6 vs 7-12
5 M8 W0 v' {3 e# [# s5 Uif 1-6 = 7-12     13 is fake; }% H7 B  `$ E9 I, u) t

- k, E) `  H* L0 Jif not 7 X( b. k5 y& ~* p, D+ W8 N

2 g* j; W/ D/ F6 eWeight the 2 time
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1 A% M7 p7 n: R( Z" v& o: mSuppose 1-6> 7-12( X! C1 J. h2 e/ R
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1-3 vs 4-6
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# ?* e  D! ]2 e7 h; G: \4 hThen Weight the Third1 f% R2 Q0 ?' a! R, T
3., v: ?, n5 x6 W1 j
# ^8 i7 t3 o! p: e" ^( ?
Suppose 4-6 > 1-38 k; S6 }1 D% j6 q. j
  S- H. w$ r6 m2 _2 f
Just like the first Step
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$ Q$ W( Z+ S8 q8 E/ H* a: X; l4 vs 5 ; O" ]( {" s; M8 R. m" j2 r
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if 4=5 6 is the fake one 3 Q7 V+ C# L1 c1 E
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if 4>5  4 is the fake one 9 j2 y  [8 T+ W  B
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and so on......................

hello1997

分3組4隻波子秤+ @: T" \; h8 }* X) Q+ {
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Group A: 1,2,3,4
! |% M$ v; Z) f* a: Z' P; W  LGroup B: 5,6,7,8/ P+ w3 {; E( Z6 t" j4 \7 o
Group C: 9,10,11,125 L: `  c1 ?0 g9 b+ M1 F* L$ k
Group D: 13
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* V* `* F0 q, j& W. N$ gRound 1
* h  W4 j9 ^3 qGroup A vs Group B5 u; R  n. |* v, j8 f  h
如A and B一樣, 即較輕一粒在Group C or D$ m/ k& S& |9 g

" }/ t& j* U1 i/ h9 X' mRound 2/ z1 D8 d3 Z# W8 P' n! t6 Z$ N
再在Group C拆成:
  G; l8 @9 C- D) [0 w: O" w; PGroup Ca: 9,10
' l& d6 k! x, h: T9 A8 ZGroup Cb: 11,12
6 j8 z" d0 ^$ L, l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,
/ E& J3 Y8 L. _( z% H# W, V要再秤, Round 3, 之後便知答案.- i6 S0 g! p  ?' B: R& f
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e.g. #1 假設10為較輕的一粒
( x# U2 c: R2 G5 wRound 1
* X' f+ k( u! O) g) B6 I1,2,3,4 vs 5,6,7,8 = equal
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Round 2* _$ o) u* v+ j/ O( k0 w  E8 }
9,10 vs 11,12 = 9,10 < 11,12
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6 o& S- `7 `+ G8 [6 ]* ~Round 3
! k4 ]: n0 H' r4 @* ?, n" b9 vs 10 = 9 > 10
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The answer is 10.& n/ N4 f# N3 u
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e.g. #2 假設7為較輕的一粒
: K  G$ k: Z1 dRound 1
/ Y) G* O/ p1 O/ ^) G1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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/ D3 r! d' W0 V# r4 N" B0 }: ORound 26 ]! d: d7 m: G; Y
5,6 vs 7,8 = 5,6 > 7,8
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8 @) d1 P2 H/ `( X$ ARound 3
: g6 a8 A( n3 O5 @, r3 J" N7 vs 8 = 7 < 8
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- G& K" X1 R  F* f# t! ~7 u, U0 [The answer is 7.
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e.g. #3 假設13為較輕的一粒
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1,2,3,4 vs 5,6,7,8 = equal8 W* Z1 E9 d* Y

2 d9 r6 S; z7 I1 o0 vRound 2
0 m9 i2 D, D& o9,10 vs 11,12 = equal
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- b7 y5 t" N' d$ A' q0 `. J% bNo Round 3) w3 x( p4 T, V
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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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8 H% [0 y6 K" P' ?& D6 {% y' o2 b1-6 vs 7-120 }* U* E8 R+ Y7 D" X+ l
if 1-6 = 7-12     13 is fake
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) l& A; N0 e4 j' Pif not
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3 A  T0 N" \# s2 c+ y- c# d) \Weight the 2 time ' C2 _# u* p3 n/ v+ W8 k+ f

8 [4 Y3 F) P2 U2 YSuppose 1-6> 7-12
! W6 a8 ]: G9 ~7 M6 R$ K- j1 X2 {) b
1-3 vs 4-6 ; w4 Z8 [+ J0 Q& D4 c9 z

& L/ H, D! Y9 p! JThen Weight the Third$ }" r2 Z& c' J* h; J3 p
3.  E, c* S1 ^- z+ C5 ?
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Suppose 4-6 > 1-32 i/ e  _( K$ o0 s9 @

: f0 Q- ?. ~& I( O- l/ Y/ T1 pJust like the first Step
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4 vs 5
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if 4=5 6 is the fake one ! d  s0 J1 u1 x  N

8 b9 g! f2 |  |( y' P. bif 4>5  4 is the fake one
$ S& W2 q2 ]- M: B! W  Fand so on......................

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問題第二步
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/ J2 f8 J  ]* Y8 m. A( s! W3 tWeight 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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% P$ P( l, {& B9 u( ]6 H3 B4 i9 q5 F& @你第三步点去搵 7-12 边一粒???
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% d: ^$ I, R, }2 N; `& K========================================
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問題第三步
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+ t! [$ p1 q8 ~  N$ VWeight 1:  1-6> 7-12
+ X# d# X1 K! Y4 h% \- p4 P) M
+ ^, m0 r# ?+ h; r, g6 @Weight 2:  4-6 > 1-3
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: h2 p7 ^. J0 h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