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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『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)。+ \+ B8 U5 P. C, X4 ?( g4 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？』2 ]" x0 G2 @9 U* _" @0 X8 O

# q0 m+ h3 p  H注意: * o+ o7 D+ O" m0 h. G1 g/ `, G3 k
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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# w6 @; p7 W/ U  c) m1 u6 p7 j) {1 f

7 {/ T2 s* k. |- a" \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, N1 k) c' k$ J
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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:
( d0 Q* ^" Y( c, L$ K- o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,' _- }$ N: m' \5 O1 e8 f
等我搵下仲在吾在2 W, r" n  ]5 p  y
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當日用左37分鐘答１２粒波子，差７分鐘才合格。
. o, I8 y: }/ t/ l1 v13.........
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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,( B+ r2 ~" t5 ^
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 W1 e$ ]2 v  J8 r8 b+ J
唔識隱藏...已經諗到..

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sor !!!....e加改左
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! X- v, P0 ?: |' y! E2 L$ B2. 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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& v4 S( `8 g* y7 g[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
0 w! c. }# |7 m2 `, j* ^, c8 P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.4 v9 T6 M8 x) g" W( J5 D+ L

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playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:4 D0 y, T3 n8 }5 W' `; }2 i+ M
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6 e; G9 v  v3 l1 t7 [PlayPlay, Let me know later who has the right answer and I will add points accordingly.: S1 y0 J& t3 ]/ K  k3 a8 h+ g

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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

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1-6 vs 7-12- N% n( m. _: }& R) D
if 1-6 = 7-12     13 is fake
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Weight the 2 time : p" b  z" F2 A+ W7 D
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Suppose 1-6> 7-12, @) k* [+ Z# P, I1 Q# B! ?
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1-3 vs 4-6
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1 f6 ?! x; a5 x8 h, PThen Weight the Third
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Suppose 4-6 > 1-3
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0 c1 k, M1 C9 Q) y" Q) Q5 A: s5 C& dJust like the first Step
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4 vs 5
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  o7 T# r8 k! Oif 4=5 6 is the fake one ; _8 `' [2 m* \, z0 @" K$ H7 C

/ w" a' F  o, l) C: |if 4>5  4 is the fake one
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& ]4 H! r( w, M2 x) k2 wand so on......................

hello1997

分3組4隻波子秤
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0 o! J9 ]- [% l* q, {3 HGroup A: 1,2,3,4
: c" p3 I8 w/ O8 ]Group B: 5,6,7,8
/ n' @8 A+ M/ s  ?9 A. T( ~6 eGroup C: 9,10,11,12
" z6 a* H, r. ^Group D: 13
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: {6 j% R3 I+ K! W5 dRound 1
8 P% ^7 C( q: h  l' mGroup A vs Group B/ c. A1 L+ Y4 ~9 t* L8 R9 {$ h% T4 C
如A and B一樣, 即較輕一粒在Group C or D6 y0 G: [: l: Z! C/ E, u4 S4 ^
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Round 2+ D4 ~2 z; ?2 z
再在Group C拆成:1 F5 _4 v" w6 f; k4 U, N$ w1 h: v
Group Ca: 9,10
9 m2 L) d. O- `7 m* Q" e9 f" @Group Cb: 11,12
% K- R0 ?, V2 [" @' ?然後再秤, 如一樣, 即13為較輕一粒.# T* Z3 `0 ?7 Z$ z

, u, ?: G  o! ]) [如不同, 即較輕一組有一粒較輕波子在其中, 8 i$ m8 l, s$ E% k
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
; j' }# D3 ]2 [* H  [# H2 w3 rRound 1
+ i- D# @' b1 u' u5 M1,2,3,4 vs 5,6,7,8 = equal
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Round 2
9 K5 P0 f( l7 t. c& C8 @9,10 vs 11,12 = 9,10 < 11,12
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Round 34 J1 P8 D7 y1 ~; Z9 x' e9 }7 X
9 vs 10 = 9 > 10
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& w3 B, p+ n4 c, d$ ~* ZThe answer is 10.
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# Q. r& \# I* I! m+ ~8 Te.g. #2 假設7為較輕的一粒
. U, ^0 L' [/ d, _Round 1- n& \. Z7 V8 e/ _5 V: T% _1 O+ t
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,88 a# e3 U( Y2 I
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Round 2. T+ H9 o/ Z6 Z5 ^# L
5,6 vs 7,8 = 5,6 > 7,8! M) G0 J. _: {, `7 R4 }6 ~' ^  P
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Round 3
- P8 A4 I+ A' s% R6 ]( F7 vs 8 = 7 < 8
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% t( z  }0 ~# m' LThe answer is 7.  H: C- w+ Y( L* I* |
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e.g. #3 假設13為較輕的一粒
2 N8 A, b" z4 ]( f2 yRound 11 c5 l6 t, V2 B( i. I+ {/ o
1,2,3,4 vs 5,6,7,8 = equal7 u2 V; T* B: a! ~9 H4 g0 k: W

' W4 O& r" W7 iRound 2
3 V( Z! @; D) D4 d2 G! H$ u9,10 vs 11,12 = equal+ K9 T) D$ G' m9 \: l8 E
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No Round 3( z) g" l3 o9 ~# @* r

/ l6 L  [* F4 r& P0 {( yThe answer is 13.5 x; r: p& k8 R- W6 e
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唔知我答得正唔正確呢?! 7 @7 v; A' v2 ]
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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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1-6 vs 7-12& o: C; D3 J. `( W2 H
if 1-6 = 7-12     13 is fake
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Weight the 2 time
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Suppose 1-6> 7-12' O% [, n* D$ [+ h$ [; N$ b1 f4 I

* z, Y) Z/ T) A6 c1 K2 e0 U1-3 vs 4-6 ) D; w" U6 D- j  A2 w* p- i

1 N( U* e  I3 G+ o5 D( XThen 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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  T' Z8 L# {$ u( f! O8 x3 ~9 }9 r4 vs 5
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' J% `( O8 F! p: M" Mif 4=5 6 is the fake one
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if 4>5  4 is the fake one - B3 d- A8 H7 k; x) A9 Y
and so on......................

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問題第二步2 t4 p, J  Y: P3 o

+ P, ?; W6 m8 q. N; r& C% DWeight 1:  1-6> 7-12
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' e# k7 D+ F8 r3 c( tWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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! \% f0 B/ g. W+ T0 {) Q你第三步点去搵 7-12 边一粒???# I  d' V1 J( w" m  E0 Q6 e9 g/ x- n

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& }* @! o" Z9 z+ [& o問題第三步) b" F+ m2 S+ o2 M' A- k3 |

4 E0 ?* |* m* I2 x) `3 t* U' zWeight 1:  1-6> 7-12. F7 \. q# v- j2 ?9 Y" W. |3 y( i$ J
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Weight 2:  4-6 > 1-3 , ~  @2 ?6 M0 v6 v9 ?1 e

9 ^- w9 ?  ?  H8 G; m' M$ l2 I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