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# j' T& a7 x8 [! J
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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)。+ N$ j3 r& z( q1 B5 P4 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？』
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注意: % r! f, A8 e) A  X* K

* t# R3 E" i. z3 P1. 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
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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+ A# @5 f+ |$ n) e. S

0 q6 j$ Q) M+ i2 A( R5 C[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
* v" b$ o" s5 l! 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,
, Z0 B, {, N, ~4 q7 I7 |# Q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。
% z* [  ?' T6 t2 d1 x; W1 b( k13.........# a; I+ l: Y, M  k

, b  @& A8 ?$ m7 r- j) `7 j[ 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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  h% y/ E1 V* a: E我以前畫左個chart去答,
7 p. ~4 F7 f( B  O. h: q5 o& v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:5 D+ m8 K. B$ s: ~8 Y5 D
唔識隱藏...已經諗到..

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sor !!!....e加改左& x( ]+ {, `. P# c( ?0 y3 H
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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
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4 |* m8 @1 s! @" P2 V  L[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
+ Y3 R: C! h; d4 V) W. f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.8 p" A' C( p1 u* A+ }& z

0 w' Y4 ?( K4 R* q; h# |) TThanks

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.
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4 ?6 [- k2 M, O$ y6 J9 D5 ?) eThanks

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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
: T9 I( h+ @* Xif 1-6 = 7-12     13 is fake! ?3 B1 W6 f: ~2 E; x) z

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Weight the 2 time ! z7 P6 J4 Q' w% f+ V
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Suppose 1-6> 7-12  |& a  y( n3 U6 u- d! r% c
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1-3 vs 4-6
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/ G' X  ^9 e) L! W& C; ], xThen Weight the Third
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Suppose 4-6 > 1-3! j6 z3 ]& E$ o- u
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Just like the first Step; \' |+ L( M* z6 f0 _
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4 vs 5
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' h# C8 N' z4 b6 ]$ \0 p% Wif 4=5 6 is the fake one $ ^) p5 r* D$ D( S  r$ _9 p! W
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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* p* ?8 g& c3 X( S7 e' W

, M) W- B+ W" F) ?5 W+ D( iGroup A: 1,2,3,4
' O, L. m. o; AGroup B: 5,6,7,8* q: u" h$ A5 K0 V: Q
Group C: 9,10,11,12
2 ]' h. E( A: I# qGroup D: 131 J/ \; @' @% M5 B% z2 \

# ~1 z! i* ~8 J- R% eRound 11 y" r9 ]5 V; r! o* G
Group A vs Group B
+ m( o* f+ ~) `# I8 B如A and B一樣, 即較輕一粒在Group C or D7 H) c4 V  t# G* I/ E2 t

1 l9 b- G( ?0 p6 g& eRound 2
6 E1 P/ R+ d7 c8 |4 N9 i# u再在Group C拆成:
- m$ z6 _& b6 r- R8 r4 }0 ~Group Ca: 9,10
2 {5 Y4 l& X& ~3 \9 W1 G# ZGroup Cb: 11,12
) Z3 m. ?: W) C; i# n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, 8 F6 m3 [2 i2 _3 @% F2 a
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+ |" b7 Y9 b" Z9 ERound 13 f2 [) Z( Z, y! y: S" ~6 ]" {
1,2,3,4 vs 5,6,7,8 = equal- q1 l. J4 |" r* @

2 G/ a/ c5 G7 Y2 M9 o3 SRound 2
; K) g+ b' H2 d  T' @' \7 d8 L# l! ^9,10 vs 11,12 = 9,10 < 11,12
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Round 3! i) W2 c- Y) f7 y" Q; T3 G
9 vs 10 = 9 > 10/ f& @3 {- b5 F- f, ~) H
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The answer is 10.
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8 x2 }  E* @' E; _e.g. #2 假設7為較輕的一粒5 f1 f5 U$ L" \
Round 1
# v2 C, s% f$ [6 T+ J1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8# {) T* G; X3 o! W- I

- M) @) V+ F+ v1 Q4 aRound 2
& ?* b) j. U0 i, W5,6 vs 7,8 = 5,6 > 7,87 j% f6 E- `/ ~6 g8 P. p
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Round 3
  a! ?* ~7 v% A6 d7 vs 8 = 7 < 8
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# g/ H% F. Z5 ]- U3 ~" MThe answer is 7.
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8 r! M, G5 E7 O9 r! Ne.g. #3 假設13為較輕的一粒* V; j* s1 `4 g: n
Round 1
& j$ a8 I2 p$ Q4 z1,2,3,4 vs 5,6,7,8 = equal
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Round 2
# B# o* M* N$ A; w! M9,10 vs 11,12 = equal9 E9 r6 ^3 A0 w( Z

: ]% R0 p+ ^5 S* G1 R: _No Round 3% P# e' V1 J& F& Q2 U" j

( h5 B' T  I" L( _  VThe answer is 13.0 x" g+ F0 @, ~- u# R: g! |

( y2 A2 R: g; t# W" u9 n' b唔知我答得正唔正確呢?! * w! g2 X% p2 o/ `( \6 a

# e- X- t# o* Z% _[ 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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& M1 o/ F; T( }; v% I; ?1-6 vs 7-12! w0 E2 Q. }4 W' r8 ^* q
if 1-6 = 7-12     13 is fake
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Weight the 2 time
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( f) }( {5 f5 `0 C/ d, GSuppose 1-6> 7-12( x6 k2 J6 E) r. m& B

4 {% u) |4 A7 |, R2 ]/ m1-3 vs 4-6 , v  \# ^; K" z2 y( y5 @9 y3 l5 W! v4 g2 a

! T/ n9 |# _" J* X* O/ b/ ^3 TThen Weight the Third! V9 `) z2 ]/ D6 V$ H5 f0 }
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Suppose 4-6 > 1-3/ b; L( X' I  n8 Z% M
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Just like the first Step2 r: x4 s& J% W" f& W1 n. E- P5 u

; }$ o8 R- I. t$ g9 E' ?4 vs 5
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$ U* F. E2 Y) E/ Aif 4=5 6 is the fake one " C4 A8 ~- J( h5 ^, ?
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if 4>5  4 is the fake one
( N( w* }8 l; G) b! V1 Oand so on......................

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/ Y3 O5 Y/ j+ w" a9 w! I. j問題第二步
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Weight 1:  1-6> 7-12. a9 T/ y+ ~: P+ |3 M6 U/ @
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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  [) w/ M/ K/ J$ c7 H你第三步点去搵 7-12 边一粒???
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========================================2 }$ T; l) ^3 k3 c

! N! s9 Z" C* ~) e( E, b問題第三步
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& \( B$ G0 i! X$ W% LWeight 1:  1-6> 7-12) Z' Q% G' D& q

5 o2 H" r$ ~  C+ k: Q: nWeight 2:  4-6 > 1-3   A- ]1 N0 A  e  F; m) N) z! t% {& @

1 ]) x' h' Y1 r2 y: J( l# H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