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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% p" O, H5 b# U* B7 r『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)。
+ {& E& q9 y- w7 e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？』) a" C$ A+ p8 H
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注意:
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0 x+ ]+ b/ F2 A' Y1 Q1. 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9 X5 L% A, J5 d4 [

/ y! [; y2 {7 a8 Q+ y+ E' m' ]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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[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:: x" Q2 y) e* d! n2 F
相信e條題目都有吾少人玩...

+ R5 m+ n- M! p- ^: o我以前畫左個chart去答,
& k3 J9 s) e& \5 q% f% x& F8 f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。( r$ l. c2 _. E- w) N: 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:  Z; J8 F0 S- r; m: \4 s
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我以前畫左個chart去答,
7 g( ]1 {$ N2 T& H! r: \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:
3 |% K& u$ i$ s' a; l' }唔識隱藏...已經諗到..

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7 r- J& p7 M% ]$ Xsor !!!....e加改左
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0 s; m6 }" a: T1 v  K9 U2. 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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5 k. T+ x; ^! n2 u[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
- S; g- E) E& {* @* {9 R7 |$ ]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.! J, G( P' E4 w6 n  f
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Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:% p5 ]" Z# ]( |% M; Q; l. y

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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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( a9 T5 h: b9 N, g: v+ I不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.4 X& ?3 y9 m5 s% a* T& q$ e
1-6 vs 7-12* _" g1 P. ?  S1 F6 D/ f  K
if 1-6 = 7-12     13 is fake9 f" D; i: _% l7 g

" X9 p/ _8 A5 z- B; q4 U9 Kif not
4 Z% h8 w5 o3 I. d9 M$ M" n, c$ k
) {" u0 [* B  u" a! P% oWeight the 2 time / K1 m; ^3 i4 e3 n/ d6 k
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Suppose 1-6> 7-12
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1-3 vs 4-6
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# L0 d4 g. ^* ~- g' NThen Weight the Third
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Suppose 4-6 > 1-3* v. n/ }; M4 l6 d1 o

# k+ J5 G3 j9 sJust like the first Step
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4 vs 5 ! M- |- O' {& C% ?# Y4 H
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if 4=5 6 is the fake one , `7 v) V: R( \$ p# x+ N

: m$ O# X: U8 C* r+ z: ]if 4>5  4 is the fake one ( [1 S6 x7 g0 A9 Y( u; S. A2 e
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and so on......................

hello1997

分3組4隻波子秤9 i& ~: L" y! ^3 Q- W, W

# Y# V0 ~4 }6 @+ h& D* H0 ]& C, b7 RGroup A: 1,2,3,4
' e! ^6 a) C0 jGroup B: 5,6,7,8
! K5 k4 i! j. J% O' x7 V& `Group C: 9,10,11,12
2 n% ?; m( \! z" p% T8 \# RGroup D: 13
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Round 1
2 Q, c+ Y0 T9 o6 R) Z" m) nGroup A vs Group B
- {$ x* K$ [3 B6 m如A and B一樣, 即較輕一粒在Group C or D
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Round 2% ^  s1 T  [* X0 s$ t* k
再在Group C拆成:
3 P2 f& g0 G* s" GGroup Ca: 9,10
8 p7 G$ X: w, K' j. y) i8 dGroup Cb: 11,12$ W) \6 t+ \: f; w+ |4 p
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, & m5 x# D# F2 ~( n* f! n
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& `  }# G+ d* U- J- i" e2 Z
Round 1
, a- \. J, w2 F& {1,2,3,4 vs 5,6,7,8 = equal5 i! \1 b6 X$ t# f: }/ ^
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Round 2
  d0 S2 e2 J" V( C9,10 vs 11,12 = 9,10 < 11,12
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6 m7 m$ @. U; ?. aRound 3
* `: ~# Q7 [  o% }/ c4 `9 vs 10 = 9 > 10
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, S1 S% ^, H7 c/ q& p0 t& x0 H; hThe answer is 10.
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: @* x7 J" q( }; F" |e.g. #2 假設7為較輕的一粒& ^  a* P" I* I% s) l  q# G
Round 1/ H2 W) T' z0 D9 x6 X
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 27 j% T* t' ?6 V/ R5 [
5,6 vs 7,8 = 5,6 > 7,8
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Round 3
+ j; ?5 H: L$ Z, ?8 E; Y7 vs 8 = 7 < 8
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The answer is 7.( a6 b2 g; u) R: a
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e.g. #3 假設13為較輕的一粒
, ?; P/ {! V8 _& k# F  f* ^Round 1' M( d7 G& K2 Z# \0 z. t- @
1,2,3,4 vs 5,6,7,8 = equal
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1 m. ^+ U, y& hRound 2, c& V+ z. I  t' }1 w/ T
9,10 vs 11,12 = equal6 j% Q. A* R+ i+ m
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No Round 3
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The answer is 13.5 S* h. e7 h; I. l8 I" [
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唔知我答得正唔正確呢?!
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) {# ]8 {/ c- h4 g2 o[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:# i0 _3 n% J$ E5 j
1.
5 u- m2 o8 ]# S- y$ s" k1-6 vs 7-121 n; V. @* _$ g2 ]
if 1-6 = 7-12     13 is fake
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* d; N7 |: p' Q+ r1 z. dif not
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9 Q0 E! N, }& i* E" ], HWeight the 2 time
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2 ~8 P" B: S0 p& o- w! z3 pSuppose 1-6> 7-12" N# q! g+ f" a: ?2 m. Y

) w8 Y1 J- A0 ^* o1-3 vs 4-6 ; Y( |- M1 m5 {/ q
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Then Weight the Third
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Suppose 4-6 > 1-3
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, g3 x2 X! O7 E" n6 o% b0 `Just like the first Step" T0 Y) a* w) e' w0 G: x

2 y0 X$ J' v4 I- m  d4 U# E4 D1 H& D' s4 vs 5
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if 4=5 6 is the fake one
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if 4>5  4 is the fake one 8 k9 M. ]: C: \' v& N: Y
and so on......................

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問題第二步
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9 m/ I0 W+ Z7 m5 a  m, I$ P' WWeight 1:  1-6> 7-12
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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???
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4 }/ x9 U. j% ]+ X1 x' _========================================
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問題第三步
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* O" n  [2 y' T( R. l2 e0 DWeight 1:  1-6> 7-12- Q9 E  g2 P, U; ^) Y$ I  b
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Weight 2:  4-6 > 1-3 0 o/ ^+ u  m) w+ f$ M

/ s" [% D. `3 @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