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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* e, R" {" V# G! f3 L" r『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)。& T6 W7 E5 F# y, \2 e% h, S
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:
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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
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3 C  O/ P0 ^+ A8 H8 o* G, q3 {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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[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:
# e9 `# K' L$ O# L, A6 M8 }3 P5 Q相信e條題目都有吾少人玩...

: ]. x$ t7 ^# o5 k我以前畫左個chart去答,
" K  H* i) m# L7 _8 g  A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。+ \# d: j  W$ y4 l% C: e& X8 d: J7 u
13.........& F0 Y& O5 u) `6 ^! ?
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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:/ A" y. z1 w+ b8 w+ T& M! q5 H
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我以前畫左個chart去答,2 I8 b. M8 k* H4 O+ |
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:
8 h: s' v3 X! R$ I% C; Y唔識隱藏...已經諗到..

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sor !!!....e加改左' a: @- O6 ?6 O9 Z

: E7 O' F/ D* q5 P! E. Q2. 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 w! V3 O6 ~& o) D4 U- H' Y( |, J[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
( g7 t2 ?$ ?) X! g+ a4 g" k; S相信e條題目都有吾少人玩...

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* i" ~3 G( [& t4 Q. GPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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6 t; y/ J( V% m' Z( L# BThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:) O* p9 Y* n, Y# l8 T8 k
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- q% @9 \, }" G& p; U- {7 KPlayPlay, Let me know later who has the right answer and I will add points accordingly.
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8 u- x/ C  c% e9 _( bThanks

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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.
# o5 H5 v6 P9 ?9 }- G6 a: c1-6 vs 7-120 S+ \1 }7 F8 f) i: C) K0 ?
if 1-6 = 7-12     13 is fake
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if not 7 O% ?, I, Z8 T5 J' j7 Z6 U6 O
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Weight the 2 time
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- F% F$ s7 T* H& q9 }; `Suppose 1-6> 7-120 {$ ]/ N; s# J9 G
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1-3 vs 4-6 " i7 i, \3 Q. R9 u! Z1 a
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Then Weight the Third
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Suppose 4-6 > 1-3* `4 e7 l7 }0 p
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Just like the first Step
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4 vs 5 : H. r  y( ~  }# q$ i

$ s- f: o6 D4 e& {2 i- rif 4=5 6 is the fake one
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if 4>5  4 is the fake one
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$ S  M+ ~2 y. s2 I5 p* e. @and so on......................

hello1997

分3組4隻波子秤' w6 ]4 z) O* q* p
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Group A: 1,2,3,4
8 W$ [  L6 B3 MGroup B: 5,6,7,8
  h0 G/ A6 E- r4 G+ U3 }Group C: 9,10,11,12* C4 G9 r) w% J
Group D: 13
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1 n# @. v% u4 oRound 1
4 {* d' L+ ]( o: H& i) y: Y/ m( `Group A vs Group B0 _' i4 C7 X0 ]5 a0 N
如A and B一樣, 即較輕一粒在Group C or D! `- g/ \  Y. C) Z( [
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Round 21 P7 C! P6 ]4 h+ b. g2 U
再在Group C拆成:0 T/ E. ^8 X! c, H
Group Ca: 9,10* e) ]: F/ _# m; y( I0 }- a
Group Cb: 11,12
$ e+ ]' a2 n% F9 M' w6 ~* F然後再秤, 如一樣, 即13為較輕一粒.
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" x/ @- `0 K& g5 u% |4 N5 e- g/ x如不同, 即較輕一組有一粒較輕波子在其中,
6 d5 j  r5 l( J& {: w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
+ Q4 u0 M. v" U# |4 CRound 10 D" }( o2 L/ B3 k  e
1,2,3,4 vs 5,6,7,8 = equal
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0 y$ M% l  a  rRound 2. }7 F- ~4 R7 ]7 Q* \* C7 D
9,10 vs 11,12 = 9,10 < 11,12
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Round 3
" {& S6 J- Q; e3 R9 vs 10 = 9 > 10
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9 P/ L$ N- p  ]+ H7 ?The answer is 10.
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e.g. #2 假設7為較輕的一粒
* I8 V: w6 F1 f' K0 eRound 1
7 d& B: R* E; }0 a5 H: `% s% p1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8' E2 W/ W" x, j
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Round 26 q2 p/ H: y& @' f9 W
5,6 vs 7,8 = 5,6 > 7,84 w) ]9 X9 Y+ w4 C4 p9 A( J9 _
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Round 3
5 d$ l( A8 j  T6 R$ R$ v$ H7 vs 8 = 7 < 8
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The answer is 7.* ~6 j5 q8 _+ O( f& \' L

( g9 h  Q1 c& F% c; ge.g. #3 假設13為較輕的一粒2 e- G- @7 Y3 B- u. {: e
Round 1/ Y3 O; y/ ?1 D$ Z) x
1,2,3,4 vs 5,6,7,8 = equal0 u. V$ F1 b" K6 u
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Round 2
" a# A8 ?$ j( ?, ]5 Z% M; v9,10 vs 11,12 = equal
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3 p+ M' T+ u5 X( V- R1 @  |; Z5 }No Round 3; {; r% V" c8 d' S4 G

3 Z3 D( \3 a% a7 W& LThe 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:' z' I# H* K5 a: c: f2 ?' O5 {
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1-6 vs 7-12. C3 n7 J" {2 L; d
if 1-6 = 7-12     13 is fake- Y( s+ v% z7 |2 g+ _
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if not
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Weight the 2 time
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Suppose 1-6> 7-12
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/ n, |, Y+ u8 ]& I. o* U- U1-3 vs 4-6 . J1 w! v1 z% i+ z; `* Y

/ E- {- A7 a. tThen Weight the Third
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; S% H  X7 f" F) m" XSuppose 4-6 > 1-3
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Just like the first Step1 s( R; C  \- R5 W) m; b

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1 U1 U  B) F8 n; H$ w- m5 kif 4=5 6 is the fake one
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7 {7 q0 k$ Z3 _  q7 x; tif 4>5  4 is the fake one 5 x0 n* F9 |" R
and so on......................

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+ S5 B5 e- g4 c. G問題第二步
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" t  E3 o# D" I$ B) bWeight 1:  1-6> 7-12
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- {8 c- q' p4 X" R/ zWeight 2:  1-3 vs 4-6 , if 1-3 = 4-6* _5 J- n: H' f# a# w

9 `  K; S) n9 |8 R# c8 h5 R3 \0 W你第三步点去搵 7-12 边一粒???: P- B7 W' H, l

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問題第三步
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$ v" \6 K; Q% u$ _Weight 1:  1-6> 7-12
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4 j1 `! D' K& E" x4 FWeight 2:  4-6 > 1-3
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; h- `% p$ [' \% R, O2 G0 T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