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)。- f0 O& E, Y# K0 ^2 V
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？』" W$ [, S6 D) B  N
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注意:
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6 @) Z$ `8 @9 s% M2 a. A, L1. 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* c4 y! _7 X1 q9 t

& D" X* `7 {6 T7 z8 t4 n2. 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:; C4 M; Y. a9 O; G* `) S
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,$ h4 N1 V8 A+ X& @# e) v0 j2 i
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。% e: \; }, t' z  D( @  P
13.........
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& ]3 d% R( e  [. w# O[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:# g% e! A; ?( p- v
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我以前畫左個chart去答,
- l1 b% G$ |( q3 Y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:7 I% i$ }: U* \6 i- E: |
唔識隱藏...已經諗到..

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7 u$ Z5 b+ r6 ~1 k7 Esor !!!....e加改左/ s$ w) }6 F5 V
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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0 y3 q% O  y, m9 P3 {' p

; C( g# S5 n& h! t9 b$ G- D[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:" J2 |( N  b1 W
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.! M9 t& T1 w9 ]5 |, A

8 M! I) q' @8 ]Thanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:4 W  _, w9 R! C
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: ?' d7 F  a0 c+ VPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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1 y8 x/ I8 M3 ~Thanks

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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& y, z6 G0 J+ H, U( l
if 1-6 = 7-12     13 is fake  s7 Y+ v* a/ b& _' s3 ]/ H* q

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Weight the 2 time
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) W- O6 G( r& g* u* w. FSuppose 1-6> 7-12, J. f! s) _! M- ]. c
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1-3 vs 4-6 / @& d! J7 r8 F/ f8 c( w: G
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Then Weight the Third
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& F7 `/ n! c- [9 {( f/ aSuppose 4-6 > 1-3: U; Z0 g1 s: W3 {
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Just like the first Step: A$ t3 I7 r$ J! P, U5 P$ b
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4 vs 5
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/ Y/ C$ q/ \) v0 L* Hif 4=5 6 is the fake one ( h' u5 f# Y: f1 u

$ `. B4 k6 j- E8 N5 w# ~if 4>5  4 is the fake one ; b! k, M. f! ?5 H2 }

3 e/ m0 k& |$ E8 w6 Wand so on......................

hello1997

分3組4隻波子秤7 c4 T. Z3 o) _. v
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Group A: 1,2,3,4% d2 s& E. B9 N
Group B: 5,6,7,8+ `& G% q- A: ^: ?9 T1 ^
Group C: 9,10,11,12
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Round 1
, }( W% ~( \" e/ c0 J5 gGroup A vs Group B6 c( Q/ `* f5 l% Q
如A and B一樣, 即較輕一粒在Group C or D* M# {' ?" d5 o, V% b
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Round 2, r4 n% S2 R( d0 q. H( H0 B) P
再在Group C拆成:
+ X. Q3 l3 B' |: D; v  yGroup Ca: 9,10
+ }: e/ J9 ~4 O) `9 s# @, }+ zGroup Cb: 11,12. t! r0 u. @- N7 C
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,
% @% h2 o0 j  R  p要再秤, Round 3, 之後便知答案.
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! R& a* P3 |+ T! ^e.g. #1 假設10為較輕的一粒
4 n$ I7 e! v! U7 C: A7 m) m( O' h! fRound 1
) y, F6 G: K; K2 i6 ^: g# U8 \1,2,3,4 vs 5,6,7,8 = equal+ Q/ Y; s" q: }' |1 ?
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Round 2
/ D( L1 ~3 G" u* H* {" ~0 c9,10 vs 11,12 = 9,10 < 11,124 r) {6 L+ Q' Y/ _

% Z6 x0 \+ n4 z  @5 t6 ARound 3
+ e8 x& |3 G7 m3 i' Y/ k9 vs 10 = 9 > 10
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The answer is 10.
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' u# w6 K% {( ?7 s4 Oe.g. #2 假設7為較輕的一粒2 [" A9 c3 H& M
Round 1
9 a$ M! K9 B! z. z: }$ W1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,89 O9 p: f  m1 O. l+ ~
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Round 2
( G8 q& L9 d* U; L9 |: ?0 Z+ l5,6 vs 7,8 = 5,6 > 7,8
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, [- N0 y8 u+ RRound 3
' W; D0 M& t) c" v: q, V$ H7 vs 8 = 7 < 8+ j6 g% F7 n# z; Y% J
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The answer is 7.+ f" D! T8 h$ t3 D
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e.g. #3 假設13為較輕的一粒
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1,2,3,4 vs 5,6,7,8 = equal
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Round 2) ~3 P" Q5 _- A" o# X
9,10 vs 11,12 = equal
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No Round 3
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The answer is 13.
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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:' `$ G  l1 C* B3 \: A! D2 I) r8 [
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1-6 vs 7-12; M/ M8 d3 I* T2 ~  J5 L
if 1-6 = 7-12     13 is fake- T5 `0 K3 p/ `2 t
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if not
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/ M5 q! N' V4 J4 ^; _( }8 |Weight the 2 time
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, U5 w! J2 d! H$ bSuppose 1-6> 7-12
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+ t" w& I9 u, _" H8 ?8 i' e* P1-3 vs 4-6 ( ]! F8 [: k. ?2 B7 G
+ i6 m. a+ }+ h# N, I
Then Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step2 K, k' A3 V# s$ e
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4 vs 5 3 Z7 x7 X% i# D" L: u; {

# N. V6 c* C, v+ f" k  kif 4=5 6 is the fake one   ~7 b  z+ a) s/ A% ^* X& F
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if 4>5  4 is the fake one ; B2 R4 ~7 i) l; B3 Q
and so on......................

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問題第二步
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Weight 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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9 I5 m# v1 [( W3 _( t( U問題第三步7 ]7 J) Q% O# J( a; J* u
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Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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" P) Y8 g, O8 B* ^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