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$ q+ J0 U) T% h. u' e' t

1 R8 K0 `) d0 x% D. u6 X: v. E『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)。: p0 V7 Y3 t0 i8 l/ @
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: 3 Q( y1 s* ~( j" X0 @1 F9 k1 ^
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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% a) v0 i! a+ o/ H) ~5 Y8 ]

( i, I5 `; n* Z9 G2 d) h4 W# ^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9 K5 X8 ^# G: }  p- G4 Q/ a  O
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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:# ^- H6 {' @* y  `  _
相信e條題目都有吾少人玩...

2 U1 S# a/ n- z4 K' f1 x7 l我以前畫左個chart去答,
+ m" M# A3 |' ]5 v' E1 n! {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。
. \5 v) F$ b4 F2 N! m( \13.........7 x1 J4 }4 ?/ ^2 M
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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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5 i; g& W" Q" B0 r! |我以前畫左個chart去答,% v' \$ }1 j9 {) _
等我搵下...

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/ ^  k$ _+ }( @& f$ H0 a$ g1 u; f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:
* R6 |: u& c8 y7 B3 x唔識隱藏...已經諗到..

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sor !!!....e加改左
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# u9 W7 [7 e6 W3 Q$ T% ~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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! R; b2 p* N& j9 {5 w4 `[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
2 w* y9 ]% ?1 {, r7 d5 T/ k相信e條題目都有吾少人玩...

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2 o/ V: f+ b; F) g% `2 x5 r$ v4 \PlayPlay, Let me know later who has the right answer and I will add points accordingly.
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2 M8 b; _/ Z3 O: ]$ i9 [( a2 V- FThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:9 }7 k" v* s' o/ V0 ]

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5 ]; o; ~# Y0 P6 d7 ZPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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( C7 A8 J3 e' s0 o$ f& hThanks

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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.
& T) j. F8 x4 q, n8 q1-6 vs 7-12
& ~: d1 D( a; H. L" z0 i8 g! Q1 pif 1-6 = 7-12     13 is fake
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# e% Q/ U# X* T* Mif not
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( u& e" s. R3 U/ F4 B" h1 |Weight the 2 time
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8 w# {' p# N% L% r8 q# ]) d. ESuppose 1-6> 7-12  ?) [8 o) B4 w+ y, l1 Y0 I

) u$ \0 a* k5 n2 C1-3 vs 4-6
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, j% d, u  w8 v3 ^, a4 g$ hThen Weight the Third+ k7 D* i# X' b
3.
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Suppose 4-6 > 1-3
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Just like the first Step( R* ^# Q% S) w9 _2 X9 t
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4 vs 5
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if 4=5 6 is the fake one 7 p# Y# y6 P1 A2 k  N% S: \

1 @7 {' X' m' _# l8 N& Tif 4>5  4 is the fake one 8 E- P" t2 Q6 A2 n

5 [# I6 I; n$ \and so on......................

hello1997

分3組4隻波子秤
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7 V5 q5 a3 E6 t" gGroup A: 1,2,3,4
  ]0 O! i2 U6 S9 }2 {Group B: 5,6,7,8
  j* q# q4 ^( j7 @Group C: 9,10,11,127 R9 {6 O" d5 L, `/ F) `
Group D: 13
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Round 1, }8 _4 b! M; D2 _0 c
Group A vs Group B
( z8 y9 x) X% E3 Y; E; X0 u! H8 U+ v如A and B一樣, 即較輕一粒在Group C or D
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& A6 A) I4 h6 a- z; ERound 2. m, ?$ R, s1 ]9 ~; l' e/ v  ?; f6 N
再在Group C拆成:$ A+ Y6 b. P% |
Group Ca: 9,10( U$ E9 [& o4 u% B& M9 k1 I* b
Group Cb: 11,12
$ H# Y8 S+ ]# y0 O. V0 t然後再秤, 如一樣, 即13為較輕一粒.- B  E' w! h8 I6 u9 B; X" s8 ?
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如不同, 即較輕一組有一粒較輕波子在其中,
. p4 d6 @9 \7 X2 Z; O# \要再秤, Round 3, 之後便知答案.
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4 y' ?0 {2 G5 z( [e.g. #1 假設10為較輕的一粒: a3 C0 L, a% m! G& c6 D2 _
Round 1
( M7 ]' }7 x2 L) T1,2,3,4 vs 5,6,7,8 = equal# \* f+ ^" U- k9 R1 ^7 ?
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Round 2$ U( S: X8 \$ N
9,10 vs 11,12 = 9,10 < 11,124 T! [. e& r# P. l7 k5 C
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Round 35 o) Z* Y# X. ]" J1 n2 j# f
9 vs 10 = 9 > 104 l' l1 w) E" z9 n# X
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The answer is 10.8 ^# W# f: d* g$ y. P$ \
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e.g. #2 假設7為較輕的一粒$ [' v* l+ v2 s; i" h- r. @
Round 1/ Y- A9 H6 s  ]" r
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8" k; W" e: ?9 q; L- X

! `( R. Q7 M2 y1 g: S2 g0 m' SRound 2
  z8 w: v. n- ?5,6 vs 7,8 = 5,6 > 7,8
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Round 3# n1 C+ ?" m- j- F1 }% y
7 vs 8 = 7 < 89 Y  j  T. N; S: Z

# r9 J) g* C& x5 bThe answer is 7.
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! h/ k- q7 y; `/ P+ b- p( le.g. #3 假設13為較輕的一粒
" |/ R2 }- g7 b" z6 u! nRound 1# q# x8 @- b- @0 j
1,2,3,4 vs 5,6,7,8 = equal
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Round 2
* G$ ^* l8 r+ d1 [* `0 b, [9,10 vs 11,12 = equal3 \* k0 b1 ~: G$ X

% Y. Z$ X" F, q# }3 y+ i4 c9 z& cNo Round 3- S. G  n5 F3 E9 b! E: E
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The answer is 13.! h2 }9 S* l: R7 c' s; ^% |

/ U4 g" ]  E. Z, I唔知我答得正唔正確呢?! ; g  ~0 u, F" W/ G* t+ n

) H; s! o# ^* `9 X, ?[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]

playbr2

Originally posted by Azuma at 2007-3-2 12:25 AM:0 N9 k2 G7 I6 D3 r
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1-6 vs 7-12
7 P6 g4 b8 \% q- Hif 1-6 = 7-12     13 is fake
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$ e) B( K( _- x8 Mif not
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Weight the 2 time 1 _1 }8 N& l2 p# s  H" d
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Suppose 1-6> 7-127 T0 `; ^( L; }9 X) f2 e
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1-3 vs 4-6
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: @7 \; M; H7 O9 nThen Weight the Third& U) @7 X7 H. ]: ?. q
3.  Z! j8 l: D; ^3 I8 k, P: f! n% D

/ w+ b$ E7 E& fSuppose 4-6 > 1-3# v! O( `; b" f+ ?/ w  S3 o
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Just like the first Step
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4 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 % f* d3 B3 ~! j& ~$ u
and so on......................

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5 y* _) x  Q1 [% _4 E% Z& @" K1 K0 J問題第二步6 R0 _& S9 o0 F/ X% H7 x; g/ o
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Weight 1:  1-6> 7-120 h7 k* Y5 m* U. k
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6. k& Y6 k; R1 ?' M/ e, f, K
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你第三步点去搵 7-12 边一粒???
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========================================
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$ Q5 S0 ?0 C) d: Q問題第三步4 U1 ]. P. Q. ~( ~: f
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Weight 1:  1-6> 7-122 ~& ]5 p8 E" O! q' l* R  a
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Weight 2:  4-6 > 1-3
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, I( A/ ^* ?8 ]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