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3 o1 q5 R% o" E
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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)。: M- ]. M3 B! U# W& A
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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+ _0 y+ J) E& J7 ^注意: * _" C* T$ X0 e2 a) M7 E
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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" V7 B  Q) R  a# L1 F7 E$ r% I
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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8 i7 ~; p; `# D# g- f: N

3 T$ C) x" U4 f- j  L3 r7 {3 x[ Last edited by playbr2 on 2007-3-1 at 11:54 PM ]

guswan

Originally posted by playbr2 at 2007-3-1 21:34:1 h4 S& j$ a! R
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,3 o# n5 ~4 @5 ]* ?" u0 ?* n
等我搵下仲在吾在4 V" @# `- g# U# T
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當日用左37分鐘答１２粒波子，差７分鐘才合格。( j0 u: ~4 C7 L$ V2 ^( ^% T2 ?9 w
13.........5 J9 {6 L& R6 G; O+ n* A& C

) d, J! I/ Z2 \! Q( Y5 z$ B[ Last edited by guswan on 2007-3-1 at 09:44 PM ]

playbr2

Originally posted by guswan at 2007-3-1 09:38 PM:% R6 p8 A% H& h
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我以前畫左個chart去答,) \$ |; [* C" I; L7 _+ i1 U+ c
等我搵下...

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5 Y6 |: C; |6 \( h6 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:
9 E- f" x( s2 K% n% I唔識隱藏...已經諗到..

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sor !!!....e加改左
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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4 x, M( N6 B; i9 q' X
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[ Last edited by playbr2 on 2007-3-1 at 11:55 PM ]

Triangel

Originally posted by playbr2 at 2007-3-1 09:34 PM:
) `  c5 y; L/ T2 j9 a. ?相信e條題目都有吾少人玩...

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  h8 f- Z, M/ @2 i* _( \PlayPlay, Let me know later who has the right answer and I will add points accordingly.: V) R. w: M) G3 a

- P$ Z  s) B) l3 sThanks

playbr2

Originally posted by Triangel at 2007-3-1 11:57 PM:- l4 B* w: z  A0 v+ [1 B

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PlayPlay, Let me know later who has the right answer and I will add points accordingly.  F6 E4 j' u4 E, c

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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

1.4 C/ b2 x  ]5 e* S! |/ B' Z: y
1-6 vs 7-12# `7 P4 J6 C3 r0 N! k
if 1-6 = 7-12     13 is fake& f+ B& @0 P5 s4 m7 @6 ~# U

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Weight the 2 time 2 C3 @/ v9 ]2 |* Q8 G% Y( s
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Suppose 1-6> 7-12' y' T, O: V2 u0 j* Y

. M' t0 Q, f$ v+ Y2 a5 x! f1-3 vs 4-6
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1 }$ U: n* d% {1 W! P( y3 j( kThen Weight the Third' |" S% A9 K% D0 ~  E$ R
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Suppose 4-6 > 1-3
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, W  U5 E, ^' N: @# {5 y0 q6 TJust like the first Step
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4 vs 5
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9 W; z" b9 C& Q" ?+ Y& ?; @! Cif 4=5 6 is the fake one
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if 4>5  4 is the fake one ( S+ t1 w, K+ f1 g9 j4 Y2 A
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and so on......................

hello1997

分3組4隻波子秤$ r& Z. y7 x& G1 |5 Z. }) J
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Group A: 1,2,3,41 x+ \9 V, ^7 x6 x% V
Group B: 5,6,7,8
& V+ A+ \3 H+ Q  dGroup C: 9,10,11,12
$ t' Z8 J% `2 k( {$ W) sGroup D: 13. P  Z% w2 c3 h0 Z
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Round 1) W9 N, \$ Q" [
Group A vs Group B
2 z  R7 |! k: v: `5 w: r) G如A and B一樣, 即較輕一粒在Group C or D
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Round 2
$ o, X/ K1 S& B* M再在Group C拆成:& M) u) V/ a; s( v$ B+ L
Group Ca: 9,10
- v) |- {$ W1 g3 ?5 L! a& dGroup Cb: 11,12; A$ o) l- U9 h# l6 V+ b% m
然後再秤, 如一樣, 即13為較輕一粒.: `$ v- B/ x" x$ Q  \
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如不同, 即較輕一組有一粒較輕波子在其中, / h9 {3 n% u3 G8 R, P% p
要再秤, Round 3, 之後便知答案.' d1 y0 Z! m5 h3 B

) O' p- m, @! X# Ke.g. #1 假設10為較輕的一粒
, v5 k9 i; J8 Z0 v4 cRound 1* x, T" t$ p2 p3 O6 J4 q* n* n$ I( p% L
1,2,3,4 vs 5,6,7,8 = equal
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+ v+ H, X+ y% w- e! ^$ w6 W  l) BRound 2
7 w1 K: b" \. N# C9,10 vs 11,12 = 9,10 < 11,12
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Round 31 r$ {1 Z# x9 k! C
9 vs 10 = 9 > 10
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- |. M9 w3 b# b& NThe answer is 10.
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e.g. #2 假設7為較輕的一粒
3 Y* R; H$ f, ]4 URound 1
. M, ]/ Q5 q* e  l. F+ Q: I3 `1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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5,6 vs 7,8 = 5,6 > 7,8
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Round 3
% |( z+ S  I3 L1 c) r; q7 vs 8 = 7 < 8
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The answer is 7.
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7 Z  M3 J! Z; C% t! Qe.g. #3 假設13為較輕的一粒
7 a; Z; u2 G, d4 vRound 1
0 I! x. i  D+ S, p1,2,3,4 vs 5,6,7,8 = equal
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Round 22 U: g) T& m3 L2 d) _  ~6 r. ]
9,10 vs 11,12 = equal- l2 \3 q9 o/ h

9 e2 ]& p7 v, E% m' i  [( SNo Round 36 F# y) Q, ^' Z- x
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The 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:* G" S& r" u% m( R0 z. Y# q/ X
1.
& w2 q" k4 ]# `$ [, R" k: W1-6 vs 7-120 I7 y5 f1 H4 g7 p/ T. e. P- ~3 E4 @
if 1-6 = 7-12     13 is fake
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if not
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3 W! U7 ?" M& [5 B, h3 N# o5 vWeight the 2 time
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Suppose 1-6> 7-12+ Y, [) |3 w. Z6 [5 P
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1-3 vs 4-6
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Then Weight the Third
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( r! b. i+ [# U/ e% Z- p1 kSuppose 4-6 > 1-3
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+ k& r  c1 R5 u8 V  pJust like the first Step
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4 vs 5 5 w+ d! A+ X: L! G0 r5 L

9 w. O+ _$ a' L0 Q( {7 U" M" @. Tif 4=5 6 is the fake one
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if 4>5  4 is the fake one " [7 U0 c" a1 Z4 V/ X, Q9 [
and so on......................

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問題第二步% R% `7 J& J; w9 q1 v% v, w0 J, K" t

$ s  g( O7 B6 U5 l2 Q6 XWeight 1:  1-6> 7-12& u" M4 W' o7 b8 e, H. e. s
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Weight 2:  1-3 vs 4-6 , if 1-3 = 4-6
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! w, @2 g4 J" y0 P; b你第三步点去搵 7-12 边一粒???! N$ w. x: n( ?8 b
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0 X4 V1 A! g; E1 Q$ l+ G. c' r' T問題第三步2 T" q; e% W6 V, F- p/ [

1 @$ @6 V  b$ x) r5 B4 `Weight 1:  1-6> 7-12
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Weight 2:  4-6 > 1-3
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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