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# K: G$ a5 P" e9 R* `8 ^- W' r
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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)。$ x. V# w. U$ r3 B7 W4 V
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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  s8 [8 }9 j+ ^' |: q' q% G, q注意: , `# E! D; |) ?6 i0 a/ o9 g  P

- O( ]1 r, h, x1. 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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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* R  F; G/ n( r9 K
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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:( U4 W- S2 |7 _# H
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,
  ~9 B, H: O, a7 ]& F等我搵下仲在吾在: W7 {+ h% C  y4 S& t1 C4 k2 B) v
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
" p6 x( D, |( z" P# b13.........
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; O5 Q, l& J7 P% v7 ~( k1 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:7 x+ r8 e3 m: i/ x0 f
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我以前畫左個chart去答,  t; }1 Y: I  p9 z# V4 R6 k
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:
# L! |: N+ e3 |9 D' Y7 m唔識隱藏...已經諗到..

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9 X3 w+ ~' D5 {, i; R  ysor !!!....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( p( \  P  {7 [" C$ L4 {

1 h) T) |- t2 @' N; l& u4 V; _[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
3 Y. _  n$ p/ V5 _9 m# Y) f相信e條題目都有吾少人玩...

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+ q/ y4 Y: n/ q7 e4 X2 \4 ~PlayPlay, 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:3 @* }/ {) j: P

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.  m) h1 z6 t8 f! D8 i

- p1 [$ f, O1 O2 j/ @- |0 iThanks

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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.
. H3 _) ]) i* k- g5 q1-6 vs 7-12; f& e% K8 N) D2 g0 G5 U$ W
if 1-6 = 7-12     13 is fake
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if not
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; q! `0 O7 i4 s& t( OWeight the 2 time ' C% {3 O" Q5 C, ]; P& @
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Suppose 1-6> 7-126 b  ~. ~+ H" R  d; J& F
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1-3 vs 4-6
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- r% c% B( M4 L( ^5 ]' d  uThen Weight the Third+ E/ y, J$ d+ X, E  s! z
3.* b$ `# e1 j, {# k# K
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Suppose 4-6 > 1-3' `, ]) l! ^) M6 z6 Z$ u8 H) ]
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Just like the first Step' Y$ {% q8 q0 }6 P; L9 _; v
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4 vs 5
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+ r9 }; I& x) R& n3 Cif 4=5 6 is the fake one
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if 4>5  4 is the fake one / u6 I5 D- _$ m
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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
6 k' Y* r% t' a4 X0 r% k! oGroup B: 5,6,7,8
+ F8 R1 H1 E! YGroup C: 9,10,11,12
. F, t# Q3 [$ s( vGroup D: 13
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Round 1
* b6 R# a& l* `% y' X, M7 {Group A vs Group B
9 k$ U5 j0 W+ f如A and B一樣, 即較輕一粒在Group C or D
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6 ]% s, L6 M; {* T! ORound 2+ {, m7 O6 h& i3 I9 w8 p1 p: e
再在Group C拆成:
& T7 A  W+ ^. E" N: {; Y8 XGroup Ca: 9,10
, z. X: `7 ^: g" eGroup Cb: 11,12
6 N6 S' k; Q# x/ a& w然後再秤, 如一樣, 即13為較輕一粒.1 r4 ]( A$ L) y$ a8 Z; D& o7 o* c

0 I6 ~6 Q* {) d: n如不同, 即較輕一組有一粒較輕波子在其中,
& v* S; }& x; a* K; D$ H9 G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) D6 S/ {6 k2 F) }" Y8 w) T! \5 U+ H
Round 1
( v6 W3 K  N+ N# U  f* N- w7 O1,2,3,4 vs 5,6,7,8 = equal
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Round 28 B; C2 R7 K/ ~) Y5 y; h: D
9,10 vs 11,12 = 9,10 < 11,12" L4 p/ U9 N+ e- t5 s

; W: F6 M) |/ @' {Round 3
8 l9 p6 ^6 U; \+ Z+ w* U$ j7 {9 vs 10 = 9 > 10
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The answer is 10.
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3 c2 b) \5 F/ C( P: ee.g. #2 假設7為較輕的一粒" `  p7 Z" `: W+ |  C
Round 1/ g; z4 N( `- Z: Z+ g
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8$ ~/ g( m% d% r4 [1 O

. o% S" s7 T7 QRound 22 V, ^- [0 ], v* y- o! d+ t
5,6 vs 7,8 = 5,6 > 7,8
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Round 3
! n8 E" P0 H. C& h* h7 vs 8 = 7 < 8% f/ w( j" y  S/ f# K+ }9 B6 B
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The answer is 7.2 }+ t' X: `) m% D) r& t

# n( i% y# X2 m# P% E' r, he.g. #3 假設13為較輕的一粒3 T! M0 p, Z% |
Round 1. m0 ]- p0 I) }6 p; ~- ^; O
1,2,3,4 vs 5,6,7,8 = equal
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3 r$ `9 q& R. N- I8 Y9 sRound 2
/ e# k! B& v6 c* d& M8 [8 j9,10 vs 11,12 = equal
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No Round 31 W8 D) _0 \: X; m4 g
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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 n7 v0 k$ M' R  \! c$ V6 ~7 b" H1-6 vs 7-12
1 ?1 X% S3 W0 K( w3 c) T& Qif 1-6 = 7-12     13 is fake
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2 }+ z% }9 n. sif not
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3 _1 Y4 G9 g8 Q0 PWeight the 2 time ! p" G( k" x( [( Y6 H2 z" w! D
, }1 C2 S1 ?1 k! e
Suppose 1-6> 7-126 l$ ?: H5 n$ q9 I1 S4 Q
1 t: L  n- e' A" O- `
1-3 vs 4-6
2 y9 n  k5 G0 S! t, X, f( g& ^2 a4 Q( k0 V
Then Weight the Third9 t" A( B: [& {. x! _/ a3 E
3.% i3 C' N6 s. c+ q: C. |$ g4 T6 l
% y5 O) j' C* i; M, j( y( c
Suppose 4-6 > 1-3
: H# ~$ g+ a" m9 x! a. d& J4 @- p+ F1 c; O
Just like the first Step" f' ?) G( x/ E6 \1 ^
2 d6 E. U( w. Z8 p+ O
4 vs 5
2 r3 B- u0 ?7 ?/ E8 W4 M* k, X2 D( N: c& t( l
if 4=5 6 is the fake one 2 a+ a" `+ @8 J# b7 n

1 ~9 f8 A& n  W! e7 ~if 4>5  4 is the fake one $ f+ `$ H+ [3 I# \$ V0 v1 H; O1 T, a
and so on......................

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. w3 A7 O  e+ ?; E問題第二步
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Weight 1:  1-6> 7-12" d8 L! e9 W6 Z$ |  H, [9 m
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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你第三步点去搵 7-12 边一粒???8 U% A# A2 T- r; I5 N3 E% ?
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問題第三步9 B' w) s: T/ _% L

3 O8 h: i# ?+ t  P3 f4 c3 vWeight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3 ! g3 l3 G  ?. f# G* }

5 I7 i: H- |# ^& Z" ?! ^+ z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