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7 Z0 c3 a. t! S. t
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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)。" i+ v; O; e# l0 P0 m
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？』" j0 ?% h: [8 o" _& y1 q

# B% B3 R9 R- i% w, B' t注意: ; g. \' a, I/ S: W6 O! v0 I& c
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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* }6 j0 n6 f. Q

" u% I6 ]1 o) O( M' y2. 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6 R9 {3 G. h" e7 S( g
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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:$ f- z& ~4 J4 t1 ?
相信e條題目都有吾少人玩...

  F5 e% e3 k$ f) ~4 [5 ^4 \我以前畫左個chart去答,5 U4 ]6 N9 n/ \( ?1 c
等我搵下仲在吾在
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
, P& g1 T  s/ [6 p$ k0 T. |+ o13.........9 {1 _& g* g6 y( g4 S- G4 M0 p

7 ?* s; B: o3 d* q. g( R[ 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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( |- Z$ u* o. h! ]我以前畫左個chart去答,
1 _- V* G4 U3 _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:/ \1 ?& b! j) ^1 |" S6 g) g
唔識隱藏...已經諗到..

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sor !!!....e加改左6 r% k1 x* j; ?. ]' W7 l) y. H
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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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6 Y: o5 l! k$ K1 I$ @: _" f[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:- R1 P+ b3 N" F  k
相信e條題目都有吾少人玩...

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7 D. z, j+ H& ]3 a3 CPlayPlay, Let me know later who has the right answer and I will add points accordingly.2 g, \" V+ ~9 s6 p# w
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:% s" q9 }# l) G# T( D! M
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# j% j, u) M3 b. l* P4 S# \PlayPlay, Let me know later who has the right answer and I will add points accordingly.) F/ }) {) V  w, Y2 a8 V- H
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Thanks

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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

1.4 V. S% I5 j! z/ w% O5 M+ `8 B
1-6 vs 7-12% A; ]: a9 H7 G& ~' m
if 1-6 = 7-12     13 is fake/ f0 J. F8 J6 H& t  N, f! I, Z0 H
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Weight the 2 time
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Suppose 1-6> 7-123 X+ ^2 K+ ^; k: T. W

3 F8 u9 p/ Q/ `1-3 vs 4-6
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( ^) @$ e6 V4 x8 e& |2 G' uThen Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step
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. o1 ~0 p* H$ [* O5 A9 x4 vs 5 ( G; A5 C7 q# q* d% i0 x

4 W& N) _- N# n$ p" K5 \& x0 O# rif 4=5 6 is the fake one
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if 4>5  4 is the fake one
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and so on......................

hello1997

分3組4隻波子秤
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. o8 [- G" u0 s" n- PGroup A: 1,2,3,4
# s, P% d: `; B8 r7 Q' A6 N% QGroup B: 5,6,7,8
& [( f" T) G; i: j% SGroup C: 9,10,11,12
$ ]6 o$ }( h1 ?- y# v9 b) hGroup D: 13( z/ m" k( M+ L' C; a' A/ N

+ B9 Q- q% X! ERound 1, ~) X( o, N( |
Group A vs Group B
4 V  A# _* Y1 i; M& @如A and B一樣, 即較輕一粒在Group C or D
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& G. Y$ d3 m7 a* v+ n* @/ r, gRound 2
( q/ q, N- q1 C% _* ?( @! P再在Group C拆成:
! i! _% o0 d4 l3 x! r" S+ x$ TGroup Ca: 9,10
7 r2 |( d( @" P# G! JGroup Cb: 11,12
: Z" |* j; `0 t' K6 K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,
9 D1 v9 O9 D% V  Z3 E0 H' |要再秤, Round 3, 之後便知答案.$ _6 q$ |9 r% h1 O; W5 _  X/ K3 q; E

6 W, L$ ^, q9 xe.g. #1 假設10為較輕的一粒* O9 k& r- S) _
Round 1
8 D3 L! g2 ]4 H  }$ L4 ]+ P5 G1,2,3,4 vs 5,6,7,8 = equal
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0 l0 P, l7 Q3 u+ W% b$ D7 qRound 23 X+ T/ w7 W) Z
9,10 vs 11,12 = 9,10 < 11,12! `" P; ~! a! U" B

' o/ O+ _" ~, T+ z$ URound 3
  S" O5 [+ O; O% x0 X9 vs 10 = 9 > 10
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The answer is 10.
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e.g. #2 假設7為較輕的一粒
7 D' w( O' G+ f( H" U% a8 e( ^Round 1
# U  L7 d& E( i1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,83 n9 H6 J1 I0 @. Y; \4 l& ?
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Round 2- o# w* u; Z9 Q. _
5,6 vs 7,8 = 5,6 > 7,82 k$ h/ Q* z( B* E
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Round 3
- c9 j3 o# }7 J: \3 N$ h, ?7 vs 8 = 7 < 8& {, a+ o( P8 E9 q

5 I8 R4 z" L, h: c8 T7 NThe answer is 7./ s- {  y$ Q* G: U. F

$ j2 A: [4 E. h! ]* o. Ye.g. #3 假設13為較輕的一粒
! C4 ~: _# K7 z7 s5 G9 dRound 1( ?9 X6 X* x, H  l
1,2,3,4 vs 5,6,7,8 = equal
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- u" O  X: r. U( k" oRound 2: x% v' W; b5 S: S& Y
9,10 vs 11,12 = equal
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; [8 e) E2 s3 w- M, T2 E* n! l# X# sNo Round 3
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The answer is 13., ~/ |  Y* z- z( _9 n- ^

3 l: I( x7 f# V- H6 [( p5 E" u唔知我答得正唔正確呢?! ' J6 C; ~2 q. ^( h+ F2 G* h; @
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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:9 R1 h9 u# o2 ]* f5 w" k1 l6 K
1.
5 l- H' d% s! E5 R7 d' B3 n1-6 vs 7-12
/ T) @. B/ L5 u& ?' Vif 1-6 = 7-12     13 is fake
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if not 2 U/ o9 \# K9 _" y# d+ @$ _

+ i+ T  E2 _5 ?. nWeight the 2 time $ E7 q; N$ f. |9 {4 a8 y! d

7 W) L) G+ u/ N7 R& ESuppose 1-6> 7-12
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1-3 vs 4-6 " Q/ r8 N  G" X

- w( P9 U6 F! t7 S5 ^7 t2 zThen Weight the Third0 P' z* B4 P1 s( n! U
3.
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Suppose 4-6 > 1-3( P+ z& ^# l3 s" m* }% N
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Just like the first Step
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% Y- h8 @" `2 K4 vs 5
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if 4=5 6 is the fake one ) ?" R# u* ?5 [' ]
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if 4>5  4 is the fake one
6 D& _$ p1 i" h3 s! W: wand so on......................

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問題第二步
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Weight 1:  1-6> 7-128 [- G3 Z3 l/ z7 D: S! Z5 f
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6% z! @/ N4 J( \+ o4 F
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你第三步点去搵 7-12 边一粒???; j3 O- J9 U3 m8 `
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========================================) Z7 r/ v/ B+ z" H/ d7 \) f

% y' J9 _" n+ T  s問題第三步1 r. [1 k. I: X9 O% O3 y

) [* p; r/ o! i+ \Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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1 K* r1 x9 W' H- {" g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