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)。) ]4 C4 h7 t6 j) c
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？』% Q& c0 t3 c2 f, `8 ~

3 ^- q* @7 @/ R4 Q; ]注意:
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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& k% @: j3 Q: n& u# ~6 n
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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  , hide 字要連埋 , 內容 = 答案
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8 }. ~( I2 G% f, T% N& i" R8 }[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:! D4 f3 W- J3 n# a
相信e條題目都有吾少人玩...

& L. g  c3 q' n* p- x; z我以前畫左個chart去答,' y. [3 w2 w  }( U3 y" f1 T
等我搵下仲在吾在0 C7 d8 }% \7 T1 ]5 ^) s2 j4 b

( J- m% g. t1 o3 ^當日用左37分鐘答１２粒波子，差７分鐘才合格。3 \( f. F/ v" z0 Q2 k/ E3 \$ ~
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:
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我以前畫左個chart去答,
7 Q. G. |$ W8 ?$ P+ i6 Y) g等我搵下...

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2 P5 y6 b- Y, p& N0 z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:# ^$ {8 c! T5 w1 b- n+ K5 O  |
唔識隱藏...已經諗到..

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sor !!!....e加改左
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6 z& P" R& X# k' J* R% i2. 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; D- @2 k3 q3 C

5 h2 q# [; i, g) s' e( d$ A2 R[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
9 W/ J- v8 K0 V, W3 Z3 g% R1 V) L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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PlayPlay, Let me know later who has the right answer and I will add points accordingly.1 Q6 o+ m! y+ B/ I
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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

1.
1 x+ t$ w0 w: @( l1 ^% C+ y! e1-6 vs 7-12) O- C. A1 Z: ?* l1 l
if 1-6 = 7-12     13 is fake
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if not
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Weight the 2 time
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5 @- ?- s% |; H% Q- W1 lSuppose 1-6> 7-12
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* b/ r8 K) h* ^9 K9 k8 L1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3( b+ s9 q0 P2 x; a5 @# ~& ^
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Just like the first Step
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  v  G8 b$ k7 f! y8 y4 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
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and so on......................

hello1997

分3組4隻波子秤
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; h9 `; L2 ?5 S1 I: @Group A: 1,2,3,4
# P# n+ U4 H5 uGroup B: 5,6,7,8
8 D$ n0 ^+ Q, i0 P5 T/ xGroup C: 9,10,11,12
8 I  \! e' V; a9 D; ]1 ?Group D: 13
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Round 1  z/ Q' z: i; ]$ ~* _! i
Group A vs Group B! s& G1 ?, D' k
如A and B一樣, 即較輕一粒在Group C or D
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Round 2
1 r# D1 p, }2 t) s" d% r再在Group C拆成:; ?& `" g7 [2 ?/ C
Group Ca: 9,10! R& H0 x7 d4 `) }
Group Cb: 11,12
: b1 b6 ?" f) |5 e( m2 U+ U然後再秤, 如一樣, 即13為較輕一粒.' k+ g8 F) U0 ~! D+ K( c

3 m! T4 G* V& {; X( K如不同, 即較輕一組有一粒較輕波子在其中, 6 n0 ^* e" u" d; V5 C, 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+ v) B" u& j& s2 ]8 Y2 [4 Q( |3 v
Round 1
5 C, h; M4 a3 t6 w1,2,3,4 vs 5,6,7,8 = equal
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Round 2
, K3 }/ m# l3 d4 E7 g1 P9,10 vs 11,12 = 9,10 < 11,12) o7 d" T0 P* I: u
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Round 3) @+ R1 m! L" F8 L
9 vs 10 = 9 > 10* \# l- k$ c' l* V  ]& C2 C
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The answer is 10.
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/ i& r$ {( h7 o8 ue.g. #2 假設7為較輕的一粒
$ X  W8 [  E8 t, Z' @Round 1/ D8 X" X1 u) t) z3 ^
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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0 e" Q' O( o! p- K9 l8 X" j/ s: mRound 2; ]" x5 M- O0 l* ^: ^& f2 ~8 P
5,6 vs 7,8 = 5,6 > 7,8
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8 c6 N: J4 g3 [; U4 RRound 3* h" m% |' e3 |9 x+ Z# \) J
7 vs 8 = 7 < 8
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7 w3 n8 l- M- r$ U' c: l/ FThe answer is 7.
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5 I1 J, Z( G# V& ke.g. #3 假設13為較輕的一粒, V; [% r  ^  Q0 [/ ~6 v1 R$ x
Round 1
- P+ _8 c2 C/ q6 m' U. G1,2,3,4 vs 5,6,7,8 = equal
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Round 28 ~; x( Z' ~8 `5 j8 G4 A% j! x
9,10 vs 11,12 = equal
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No Round 32 q- i1 x1 f* q, q' ~3 R; n; W
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The answer is 13.
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唔知我答得正唔正確呢?! # I& G3 \. V6 Z! q3 D- B. i
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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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$ Y2 f( i4 l  ^1 t, J& [1-6 vs 7-12
+ e4 r  \3 m) Q; \& }if 1-6 = 7-12     13 is fake
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2 ~% k  r9 h  g9 s0 L* dif not
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  E4 k! @) Z9 x8 F, i" iWeight the 2 time
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Suppose 1-6> 7-12
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* `+ ?, H* y8 m7 y" }( P% H1-3 vs 4-6
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1 D; X' M8 x" L$ i. [Then Weight the Third
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Suppose 4-6 > 1-3( X( p+ o+ t: K

* n& q: x! ~; i5 ~- e/ zJust like the first Step
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2 R  D# g$ O2 z+ c4 vs 5 ) u+ h& F, w- D( I  \' v/ B; d

* {! Z: k  O, }if 4=5 6 is the fake one
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: ~1 o! G7 ]- n1 z- p( a! Hif 4>5  4 is the fake one
9 Z) s6 w& w2 x, C$ S& O9 J) a& w1 rand so on......................

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問題第二步4 h; P7 j2 l) L4 P/ u
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Weight 1:  1-6> 7-12
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-67 M6 D* z: t$ h& \# T
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你第三步点去搵 7-12 边一粒???
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========================================
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6 @& ~* k; B+ z# U4 [" }, C3 x* u7 _" Q問題第三步
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) f) ~; @& {' R! V! p8 E( [* o& N" IWeight 1:  1-6> 7-12
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3 a! M7 K1 B3 H* c) g, XWeight 2:  4-6 > 1-3 # p5 H  m* [! z. Q; y3 j

7 D9 D! v* l9 M+ Q$ {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