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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) C% }  Q6 L, C; L『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)。
; A4 w+ ^% s) \$ X/ a& o! d0 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: 4 M; s3 @8 r, |1 J) p& s
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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
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. u  O1 v. ]# y1 H% i) \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/ K- G+ i9 q( @4 Z  Y
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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:) O; p9 ]1 x3 b* _3 J* d4 `& w
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,0 j. t5 i3 S( w# W
等我搵下仲在吾在# g; i( D6 c  S1 i3 c9 U8 h

- ~. q: N% d" Y4 J7 T# G當日用左37分鐘答１２粒波子，差７分鐘才合格。4 E! U' E  l3 U/ l" S1 G: M8 J- Y
13........., L0 e* Y! h9 e
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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:7 B% U- a- A9 y* E3 }* `" I: M

. ?7 D' d) V" I1 _- ]. r5 P我以前畫左個chart去答,( i1 o$ f, ]  [, g. o' ^3 }
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:
4 z& R: p' I2 P8 K7 g3 _, @! c唔識隱藏...已經諗到..

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: O7 {# D% |; G/ H6 Z* z" Lsor !!!....e加改左+ q; x) w# Z' S4 Y+ f0 @* Y% L, [

1 `& P& E5 t9 J2. 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( j+ _% d2 t7 A9 ~" @! E+ {

# y: B) L! U2 V" l1 n[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
/ G- t. e" T, d, B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.- Y  ?" @  i& T! M" @. }! j
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Thanks

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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Thanks

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! D' _: A$ _2 J不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

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1-6 vs 7-126 n7 X) z6 u& S
if 1-6 = 7-12     13 is fake, z( e9 K& g5 ?3 X6 ?5 s+ I$ ~! e
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if not 3 t1 m1 w" [/ Y6 [
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Weight the 2 time 1 m9 L4 h" D3 d6 a& Q! P

0 V3 h% e/ ]* K3 \8 E5 H: A$ o: _Suppose 1-6> 7-129 x/ _6 ]) w5 a! z9 Y

8 y" B3 f' l* s1-3 vs 4-6 0 f8 f$ X! ^0 p0 h( L7 _1 A5 _/ U
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Then Weight the Third
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Suppose 4-6 > 1-3* N6 O( m, i; g

! |  l5 k' o9 D' ~. Z) ^+ @1 OJust like the first Step
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3 p1 w) \5 o7 {9 c" y: K4 vs 5
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if 4=5 6 is the fake one ! B# w9 x- I% d3 @8 |, A
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if 4>5  4 is the fake one . Q! b( y# U4 E3 s, B; Q! ]

# {8 C3 P8 f" ^- j+ h" H  ?and so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4
' @% t0 e. |4 M0 h/ @4 F) NGroup B: 5,6,7,8
" D  O0 G& [0 B' oGroup C: 9,10,11,12
) d. N1 p/ r1 K$ F$ DGroup D: 136 u! b( I& L6 ?7 i0 ~$ R1 l7 P
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Round 1
" o/ M. s+ {( I# z3 oGroup A vs Group B6 ^5 l" n( }/ N2 }- h
如A and B一樣, 即較輕一粒在Group C or D4 ]% }8 x! D% R
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Round 2! E& T$ j1 ?' A2 d- f
再在Group C拆成:, Z* @7 I, U8 m6 A4 @  n6 J
Group Ca: 9,10
- h- _# l# t) r8 AGroup Cb: 11,122 N/ z3 s# U+ ~7 _8 W7 r# \* \- l
然後再秤, 如一樣, 即13為較輕一粒.! s. w6 h7 T  v& T' R. q

- ?9 F+ Y$ R; M5 [' |2 @/ c8 C7 A如不同, 即較輕一組有一粒較輕波子在其中, ; X8 _9 ~. t3 |8 _; l$ Q; p
要再秤, Round 3, 之後便知答案.' u5 [7 x) i; u( u" v

2 S7 z. q5 E( _" M$ He.g. #1 假設10為較輕的一粒* b! Y! }# H: b; E/ _
Round 14 G2 `3 e- N2 N# H# I9 n; ^- @
1,2,3,4 vs 5,6,7,8 = equal& w& t2 Y% z/ {# b- b5 Q

8 ?" g" b$ y$ K% qRound 2+ T: j6 R" P! N$ V9 S
9,10 vs 11,12 = 9,10 < 11,12
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" V. i, e4 h& f+ Z0 `7 o# DRound 39 _: b7 i5 X5 u" K  i2 f) B
9 vs 10 = 9 > 10
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The answer is 10.7 u# j; ]/ |8 `! m' T. n7 [
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e.g. #2 假設7為較輕的一粒
% v. {# N6 V0 S  C  u$ [Round 1( x, x6 o- i! ^7 P  O" Y% t# @
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8, L: [! I6 O1 O3 ?: o2 j9 ]0 T

8 Q9 v: L9 x1 O5 y7 cRound 2
8 S5 ~3 i9 ]8 T# }, v5,6 vs 7,8 = 5,6 > 7,8, d5 P- V2 Q: p# \" _
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Round 3' S, R( l! c3 I7 u
7 vs 8 = 7 < 83 y$ f- }7 }0 {+ ~. q8 t
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The answer is 7.
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' W' [4 b6 j4 g9 n$ }e.g. #3 假設13為較輕的一粒
3 R* h; i: d" }/ E! vRound 1
1 d) Q6 e, ?' a1,2,3,4 vs 5,6,7,8 = equal
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Round 2
8 [! r5 q5 S: H! d) L, h9,10 vs 11,12 = equal% l' o. k- j* M) A! g; S8 q& b: a/ r
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No Round 3
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The answer is 13.) d0 u& |$ u1 ]: M1 L' f0 K
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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:  q% L0 s# U$ Z6 V
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1-6 vs 7-12
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if not
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Weight the 2 time
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Suppose 1-6> 7-12
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, ~0 T( h, v) o5 L8 P& y. H1-3 vs 4-6 ; E7 H/ B% b3 B9 `6 _
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Then Weight the Third
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Suppose 4-6 > 1-3
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( ~) z" M4 ^2 T  S% X3 w. sJust like the first Step
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4 vs 5 * F# F' Z' z: Q7 a2 _# Q. z& k/ j. ?

" x1 z: z1 {! z" s3 \+ kif 4=5 6 is the fake one : O& q$ D, }& U6 j

- J' e3 v$ x7 {$ t" I* t4 n* Cif 4>5  4 is the fake one
) x- d4 G" N% c/ J- {( I5 yand so on......................

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: G* E% r4 J0 I: S問題第二步
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" I: d) D9 b. \3 JWeight 1:  1-6> 7-125 t( k: O8 c/ ]$ V* G$ G! @% B: D
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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% f2 w6 D; A! Q! b7 z, O你第三步点去搵 7-12 边一粒???8 }+ P' H1 j4 S  F1 v; |! D
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========================================
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; [/ ^" I1 {, Y4 \問題第三步* l5 H# ?8 K2 y% ~: {% a

" O( t4 E' f+ ~6 z! P- ~! WWeight 1:  1-6> 7-123 l4 F' O' e% b* b$ c  u
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Weight 2:  4-6 > 1-3 3 P; {4 D4 U7 P7 }  e% p
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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