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6 D0 l+ w9 H* D) X% A# ^# o, e

0 }+ Y! `+ m: b# {『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)。
1 e7 P1 p5 h$ _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？』3 r* |  H& Q& p- S

2 n( w& V- {/ g9 n' A注意: 4 p( h0 i1 D, m& i$ P
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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7 J1 R3 h& `$ A) \. T% |
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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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6 I1 W: ]9 ]% i[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
* D, v1 A6 J4 h* H9 _0 z相信e條題目都有吾少人玩...

7 D6 ^8 E' w3 a% @3 H; A我以前畫左個chart去答,
* Z2 e5 G3 E$ T0 i+ L/ a3 C8 h等我搵下仲在吾在
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+ B1 C9 k& A: L: a1 x: r* p當日用左37分鐘答１２粒波子，差７分鐘才合格。
2 f( P* t0 z0 U  E0 L" k13.........3 P4 G1 R2 d- O/ {7 o; y$ b  B

  y$ K" T) ]7 V% K3 K& o( x[ 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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# ^, |5 c+ I3 S# U% B6 G我以前畫左個chart去答,* Z7 P# E- }: o% C/ c
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+ g4 ?5 H+ u$ q0 l: H
唔識隱藏...已經諗到..

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2 M8 ^) u3 L, y3 Y7 B7 Y9 @8 Ksor !!!....e加改左; ~% V* m; Y2 D" S  `6 B! i6 {

# C  b0 o3 E, v; P2. 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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7 V/ \" T0 I. B0 o[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
  a  E7 u& W1 q相信e條題目都有吾少人玩...

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' [- c9 {( F& b: g0 X# D' vPlayPlay, 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:  P. U' o* k  {. d% p
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& U. n0 d3 ?; \: }PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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' A4 W% C# Y  o8 ~8 dThanks

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6 T* j6 `/ s3 |" I  k不如你都玩吓喇....叫d叔叔加分咪得囉........如果岩既話

Azuma

1.
# k% [6 r+ \6 e1-6 vs 7-129 V+ _# x1 O- ?. Z, g; [
if 1-6 = 7-12     13 is fake
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if not . _8 s8 \7 U5 |$ D+ {8 n' L
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Weight the 2 time
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5 U  x2 F# G) y* V! s. j- f% H' wSuppose 1-6> 7-12
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1-3 vs 4-6
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Then Weight the Third
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Suppose 4-6 > 1-3; |; f' J/ G2 ]* U$ s( ?

2 f2 H! y9 r0 D% G4 u4 c9 AJust like the first Step- F+ g3 m! H* d+ f# f/ f8 t8 h/ w' H4 G

6 L5 n$ H8 @1 B* ^! Z( P. ?4 vs 5
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1 x1 [, L9 g0 f& T0 gif 4=5 6 is the fake one
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2 P; m) B1 e; M. e" q5 ?6 Bif 4>5  4 is the fake one   z) K6 b3 Q8 y3 F. Y  z5 u
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and so on......................

hello1997

分3組4隻波子秤
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Group A: 1,2,3,4
+ H6 L8 U) G8 t! JGroup B: 5,6,7,8
% g0 a. F+ v0 t) ?3 d# }! qGroup C: 9,10,11,12
9 c9 s+ X1 ?. ?$ f* k5 WGroup D: 13# L- j  ~& \, c2 }6 g1 y
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Round 18 R. ^, @7 K  I' u# e! B. T
Group A vs Group B
- a5 V' h9 @! q& I9 Q如A and B一樣, 即較輕一粒在Group C or D
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7 J* k( I: R4 ~8 S3 O. P0 p3 CRound 21 ^2 ^/ i3 _' Y! s$ n7 O0 L5 l
再在Group C拆成:
! {2 h5 E) ]2 e7 g7 iGroup Ca: 9,10
5 d# ~: q0 I* T3 `9 n- Q1 aGroup Cb: 11,12% r* `) T/ ]2 D
然後再秤, 如一樣, 即13為較輕一粒.
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4 i" b$ D. m2 l0 \如不同, 即較輕一組有一粒較輕波子在其中,
1 X1 S7 E8 `1 `# W# q. s7 P要再秤, Round 3, 之後便知答案.9 d3 k0 c4 X( c3 F8 O" _+ u6 P
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e.g. #1 假設10為較輕的一粒
' T2 \; I0 m: R6 f8 Q( mRound 1
0 u& t5 g( l) c; ~1,2,3,4 vs 5,6,7,8 = equal
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Round 2
3 P- f  K; p1 g! p7 M- i& x9 I9,10 vs 11,12 = 9,10 < 11,12
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* V) F: |9 B5 @: MRound 3
6 R% e; f* _) b6 Y: K2 }  a9 vs 10 = 9 > 10; L) R$ L6 L# P( l2 l, s
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The answer is 10.
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e.g. #2 假設7為較輕的一粒1 o+ m/ Z( x; ^
Round 1
* w! {1 W4 H$ m/ z1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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7 W; T! I: {$ i6 G% y+ y7 ARound 24 k3 H- m+ m/ E9 `" U
5,6 vs 7,8 = 5,6 > 7,8
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3 E$ O3 ~& }. [/ FRound 3
+ u) I% A$ s0 ^. o7 vs 8 = 7 < 8
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The answer is 7.
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e.g. #3 假設13為較輕的一粒2 U% L! Y# y* d5 E. M
Round 1
  `/ K1 o4 N6 f7 X3 d1,2,3,4 vs 5,6,7,8 = equal
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Round 2
5 }$ W6 p- m. C& D7 X9,10 vs 11,12 = equal( ]" [, \' n* F. O: W% w( J. d2 m
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No Round 3
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, P. t( g: `/ g& j& M& BThe answer is 13.3 j, t+ _5 O& m* X) z& @; \

  S$ F* m. p+ |; Z' R3 O* J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:; M+ G+ C0 U: k9 n( t9 t
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1-6 vs 7-12
0 }. G( B6 K) g: [if 1-6 = 7-12     13 is fake! e& c2 n" l1 t2 i
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if not   b  N% q. g+ c2 ~

2 t+ G* ]& |5 |; G' S  YWeight the 2 time
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1 R' r% c, a" Y5 mSuppose 1-6> 7-126 C2 ~" P/ S$ r+ L4 S' I, _. l
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1-3 vs 4-6 ! `: p& [! ~: y, {2 b& n( a8 q
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Then Weight the Third
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Suppose 4-6 > 1-3
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Just like the first Step) [# U$ Q# Q/ A( I2 T
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4 vs 5
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if 4=5 6 is the fake one 6 O/ m; Q* T! K- ]

! H, p1 Q8 h  t+ @; kif 4>5  4 is the fake one
& f" T# i- `2 Z1 c8 Uand so on......................

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2 K" u7 O, v8 |4 k8 {4 p# H問題第二步# u3 i% {7 n/ N! k
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Weight 1:  1-6> 7-12( L" x! ?2 ^; x5 y% K1 k& n

6 s' \( Q* c1 X& B( E5 EWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6+ O4 N, Z4 W4 X  L- W- Y0 B
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你第三步点去搵 7-12 边一粒???
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' U) l: x, Z3 ?. s: L% C========================================
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1 }; ?4 ~. ~. t) p問題第三步
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Weight 1:  1-6> 7-125 p, o( ?  G1 W+ p" @# m
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Weight 2:  4-6 > 1-3 + }" P( S4 I% ?: n
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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