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; g; ?6 @# ~7 O

5 W$ u6 @; z) C0 n6 y7 D, T『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)。7 b  m0 Q$ y2 X+ ~$ b/ S  P
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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5 Y, r( S8 K/ x. R2 B- _注意: - ^; \2 q: a( [3 F& d

* t3 q7 m3 O- s- i& K1. 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" Z0 x( ?* G# E

' e/ L, y3 }, ]  Q: ^1 C2. 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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[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
0 ^. r2 Z6 m  y) e, N* b4 l相信e條題目都有吾少人玩...

1 E% R( X9 H* `$ s1 G) g我以前畫左個chart去答,
8 Z8 F% ~7 S% x; t等我搵下仲在吾在* B% R- @6 Z) D) u% k0 k' `
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
6 h; S2 c/ m$ `" [: K6 e( o) c13.........
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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:
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我以前畫左個chart去答,
5 {, @, r4 m  P0 u) K+ {等我搵下...

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% L! Z4 Y1 o( N! L& N+ L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:+ a7 f  ~. b0 |* m5 C
唔識隱藏...已經諗到..

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+ x& l8 z0 z/ b# k4 D, t' |! n9 msor !!!....e加改左- Q/ k. M3 u  ^! R' }' M
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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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, l9 f6 t! X% M+ Y[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:5 k: G9 b$ L7 D  n% ~! M
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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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:
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1 ~2 c  k; f% a0 Q8 a% n7 PPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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Thanks

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* E3 S! t# [$ p2 m6 h4 v不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
' l  l; ~3 S1 g& u( Y1-6 vs 7-123 J' t0 J5 |$ j1 A/ F' G* y; b6 h
if 1-6 = 7-12     13 is fake5 e3 z0 Q8 J& R: F4 _8 w( j2 y, e3 }
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if not
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4 @. [4 y: E; p8 Y# \6 a) VWeight the 2 time
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Suppose 1-6> 7-12& J( P( N* @' P- G6 P

! X$ ]2 v0 |6 x0 h$ m1-3 vs 4-6 / R' G0 h; O& h* w3 k3 N8 C0 {% y- k
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Then Weight the Third
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Suppose 4-6 > 1-3
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7 g1 Z1 ]6 i* @* XJust like the first Step
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4 vs 5
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if 4=5 6 is the fake one ) ]0 I* v# t8 E
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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* K$ u7 Z. `3 @
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Group A: 1,2,3,4
4 z: j. Y" c- nGroup B: 5,6,7,8
3 ~8 J/ n) z5 j  t5 E* K# u! G  rGroup C: 9,10,11,122 I# N% R/ }( E# H* I) w
Group D: 13- K% o, z( y1 R, [

3 Z# G. C' Y8 I6 N4 V( ^# n1 ZRound 1
' Y! @. G( k( n, MGroup A vs Group B# O0 I9 x+ Z& ^( x. x
如A and B一樣, 即較輕一粒在Group C or D
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& ^- V: B5 [. m, r- rRound 28 T+ l  M6 d: t3 X4 a' h+ O
再在Group C拆成:
  i9 m" p; T  J. k! x1 l8 EGroup Ca: 9,10+ ~" R' k; k* |) e* W; y
Group Cb: 11,12% F' `: p: X* b$ P# _
然後再秤, 如一樣, 即13為較輕一粒.
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9 W: |8 n) A+ q5 Y) Z如不同, 即較輕一組有一粒較輕波子在其中,
" N5 \7 Y* t/ U0 d) z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( l* {3 [% _! v9 G5 K
Round 13 J; d+ l* t( O& {1 A5 \
1,2,3,4 vs 5,6,7,8 = equal
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; a3 X# E7 a4 o0 N9 N2 qRound 28 Z6 ^  k. L. k8 p3 ^$ _
9,10 vs 11,12 = 9,10 < 11,12. C; Z, v5 S) D  q9 q- B
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Round 3* G% |* N% u7 t! G# G
9 vs 10 = 9 > 10
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The answer is 10.* y4 p+ H  A* n8 o, n& ~, |

$ F- e/ {7 S0 ^- C  n. Re.g. #2 假設7為較輕的一粒
/ Y* D# q. |! Z$ n% `, I$ DRound 1
3 n2 A& G5 [% E- g) u# Z# i- A1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
4 ^) S  `( ?/ ]5,6 vs 7,8 = 5,6 > 7,8
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Round 3; j2 U0 F$ N' `3 i$ H' R: C
7 vs 8 = 7 < 8
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2 ]9 E" w) f* V% g9 c; C/ m- sThe answer is 7., ^3 @4 j5 j' `7 h7 o: W  T9 Q8 U4 _- U

, N) ^8 B. @! x- |0 _% Ce.g. #3 假設13為較輕的一粒
0 i7 t8 Q6 \& U1 VRound 1
; _$ @' e! m' c7 _; `1,2,3,4 vs 5,6,7,8 = equal2 l( j: E9 k3 \
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Round 2( O# J  [& F1 s* r2 H
9,10 vs 11,12 = equal. S$ M7 O& b1 s* y& O5 R

6 Q" v6 L+ {$ r; ?- D6 t5 wNo Round 32 w8 `, a' Q7 R; F9 J

. J, U0 J5 H( {: z2 I/ WThe answer is 13.0 }; y) \" {* o- N2 m

, h1 B5 v  z! |; s唔知我答得正唔正確呢?! ; P% i( T0 s0 I8 Q; k- s/ `

' g6 h* z& Y6 a; f! f[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:
  f& b% ]3 ^. Y1.
( x' |, L! J& |% A3 Y1-6 vs 7-12
0 ]- Z" `4 p( @5 G$ C2 tif 1-6 = 7-12     13 is fake$ H4 d/ ?$ @! y6 o

2 G. b) q3 J# m/ Uif not
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Weight the 2 time ! e7 `, C* K' H$ \$ v
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Suppose 1-6> 7-12( l& n8 \1 s& L" b6 S
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1-3 vs 4-6 : g& Q7 B( t: @) W2 i3 D

4 I. s4 v( y; G) yThen Weight the Third
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Suppose 4-6 > 1-31 {. j1 d% p0 y2 o6 Y
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Just like the first Step9 _" I5 z3 y: H! m$ L+ Y

# K! Y) S  k8 c( H5 |8 u4 vs 5
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" }% N& u' K% C& o* Bif 4=5 6 is the fake one 0 B+ i: A; t1 R) z+ ~
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if 4>5  4 is the fake one   E  s1 @/ l! m6 g
and so on......................

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問題第二步
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Weight 1:  1-6> 7-12$ j4 E( O$ z4 L1 m. a2 ]' K
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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???3 @3 @% g* C3 N% F- C
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========================================
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4 G5 Z/ s" r, Y* E問題第三步7 `! m' e* r# O+ C) x8 @7 O

' f3 ^/ K# F! e' CWeight 1:  1-6> 7-12
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, x6 O9 E9 ?( i6 fWeight 2:  4-6 > 1-3 8 [5 T/ @4 I! Z4 j: j* ?$ R% y
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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