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" r5 U0 l9 z$ m
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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)。
! ~( _2 R3 \7 i; j% ^' y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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注意:
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; J9 ~8 a3 @+ B$ x9 b) u4 Y+ F1. 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2 B, L% Y4 `4 V5 i+ F9 A
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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
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. R' a& v( N; l% ?  X( i. a# H% {[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:5 }: r" T2 G- @5 [6 w1 T" b& @
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,
! u; E! W: ?2 X: t6 O等我搵下仲在吾在
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: O3 Q& }, Y1 ^當日用左37分鐘答１２粒波子，差７分鐘才合格。, Q4 e, [. r0 X" N( Y0 G
13.........
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[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:0 O. T- ~$ k8 p2 z3 V# E) ^

; ~% K" }) ]; \6 M9 E/ {我以前畫左個chart去答,3 T5 t+ Y  M: G- Z4 f
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# V. o# `/ x4 \* f% G4 Y5 y
唔識隱藏...已經諗到..

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sor !!!....e加改左5 h* o* b& A, N  h/ B
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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" _* D& N1 E3 a# R

; X9 l" P9 j, M4 I5 M$ x[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:: Q8 r1 c" K' s' G6 f) Z
相信e條題目都有吾少人玩...

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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8 K* ?8 e$ D# u$ [3 L" z- PThanks

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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" u3 p: V% e; a0 MThanks

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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.
; H$ Z; z4 F* S( |: D0 N1-6 vs 7-12/ b" ]: `# R8 p6 F, [1 S
if 1-6 = 7-12     13 is fake$ u* Y/ V) \* T: J: Z
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if not ( k& _' ?0 o/ V2 J7 D. g$ [0 x3 \& `

8 L8 N" @- G& bWeight the 2 time ' J" s; ]7 p7 x/ i. x/ q  i& [! r

' G8 I7 ^, j8 vSuppose 1-6> 7-12
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1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3# ^! W7 r- d, q, p2 {2 E

: H1 V! q/ s' J5 K1 C, s1 n; TJust like the first Step& H6 Z  P2 b6 j0 m
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4 vs 5 ( z9 Q+ e6 P: M5 a

9 h) l# E6 \1 J# S$ P0 M$ H' nif 4=5 6 is the fake one 9 r  g/ o: U1 J( W* s2 W9 T; y  {+ w
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if 4>5  4 is the fake one $ Q6 R! ~. {9 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
: _/ b6 A% X6 f. i+ eGroup B: 5,6,7,8- Z1 m8 g% _  t
Group C: 9,10,11,12( s) p1 E4 T& I& @" Q, |
Group D: 13' L; G5 U6 L3 B, {2 C
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Round 10 ?  }. F+ q/ g3 q) g
Group A vs Group B2 N$ d- j4 t9 t' E5 G
如A and B一樣, 即較輕一粒在Group C or D
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0 Q* [% L- p( E' {: e2 ?% H, }Round 22 `5 Q0 S& g% M% L, {
再在Group C拆成:) z1 R9 M2 T5 A9 y
Group Ca: 9,10
) y. |) j& ^# V+ Z6 \* KGroup Cb: 11,121 A$ o  T  c' f6 ?) G( u3 Z
然後再秤, 如一樣, 即13為較輕一粒.
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9 I( \3 O2 b& y* x5 U如不同, 即較輕一組有一粒較輕波子在其中,
" c' V! W) {" s2 V) q; q要再秤, Round 3, 之後便知答案.6 D4 R% F6 [) n0 @6 a8 [" d" m3 C
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e.g. #1 假設10為較輕的一粒* l+ V) i6 u9 i5 T! Q" w  @3 p
Round 1
4 i& C0 M; `& Y: m( F6 e1,2,3,4 vs 5,6,7,8 = equal
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+ I* u5 R2 m' R1 Z6 n& rRound 2
/ `: s2 q% Y- l8 f# p9,10 vs 11,12 = 9,10 < 11,129 L4 k2 a7 ~5 g  q# X0 n
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Round 3
6 }8 `7 e. y; {5 F9 vs 10 = 9 > 10* f- x- A. @; k& S7 I

2 c6 O, P' T& \, O; Y  qThe answer is 10.
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e.g. #2 假設7為較輕的一粒
5 Z. N- Y- h$ H# s2 _Round 1
  J5 u: q3 W  h2 G" Z1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8- m! C* _5 k$ W5 g
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Round 2) m7 y" }, P0 S: Q6 n; ~1 s
5,6 vs 7,8 = 5,6 > 7,81 F; \: x) H6 i* e, O4 U2 |
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Round 3$ J1 G3 o' b" |/ G' {
7 vs 8 = 7 < 8, Z' e2 z8 k! \; n- |1 @4 k
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The answer is 7.  d* R# {; o" r4 c0 e' @

0 ^7 ~( {* S) U9 N: n; qe.g. #3 假設13為較輕的一粒+ v6 t2 J; ~& f) w" K5 k
Round 1
9 v8 v" a, D; U3 I, Q  C1,2,3,4 vs 5,6,7,8 = equal6 s4 w/ M" Y( m* U

7 l# w" {% n& u& r  ERound 2
; C, o4 L: `+ F9,10 vs 11,12 = equal: `; m5 |2 f' o5 _5 X0 V0 O1 @

& ?  S( D- S) zNo Round 3( G, s" P3 i/ _/ @: U

" U% c: |# `2 a; H$ rThe answer is 13.% Q' ~% }( h3 W: ?/ X1 E

% J3 {6 q' Q$ Z: B唔知我答得正唔正確呢?! * x  X6 X, z; f- c& g. Q6 r

7 l3 S8 F8 t! `[ 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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& j: i1 Z- }8 d4 N- a1-6 vs 7-123 @. s& _( c" O" }
if 1-6 = 7-12     13 is fake1 C5 l) y6 Z' R8 h, i3 W* M7 ^4 X& `

+ n# e2 z' f- v: `( _. ?9 {* _if not
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Weight the 2 time
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  _& F* e" L) ]2 k2 h; G, X; jSuppose 1-6> 7-12. j& R7 I+ ~. E

' E- q% E: V& {* k1-3 vs 4-6
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7 e8 d7 g* q9 J! Y9 l4 fThen Weight the Third
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Suppose 4-6 > 1-3: Q) s3 ]$ p+ E: e% H3 ^4 ~

7 L$ s  L  Q) O; }# F1 I  ZJust like the first Step
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4 vs 5
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if 4=5 6 is the fake one / V5 j' j2 k3 v6 [% ~+ h
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if 4>5  4 is the fake one
% |  r6 m2 I: X' g* v/ S3 pand so on......................

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; o- Z; e. _3 N3 x) @問題第二步
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9 v' f' ?) j& c# B  {4 WWeight 1:  1-6> 7-121 F1 W' N5 ?3 c$ n

1 o) Q- k+ \* ~8 UWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6) V2 e1 E3 K; p  B  f2 q& t0 @7 b

$ r' u+ ^( ~' l( q+ F/ O$ D( ~你第三步点去搵 7-12 边一粒???. B! P1 X8 a2 i7 o4 X" |
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========================================
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9 o' ?0 n6 V+ J3 I# F$ j* Z4 G問題第三步" J; w3 z5 ]+ {' ~) w
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Weight 1:  1-6> 7-12, g' u& T4 f, p/ Y) E

. n  F4 k/ W4 X: t8 x6 cWeight 2:  4-6 > 1-3
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4 ?8 a. N# Y8 i" j3 T7 u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