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發表於 2007-3-2 12:35 AM
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分3組4隻波子秤# N5 Z& V4 Q% Y. U& |- }9 v
! W! R! S% r9 ~( L5 Z4 Y+ v
Group A: 1,2,3,4
- i# z% b8 j& L% B+ a! N* dGroup B: 5,6,7,8
9 W [& P8 e7 u3 h0 h- zGroup C: 9,10,11,121 ^, D# C% v: f! |: g Z
Group D: 13
5 k# [; [" ?% r1 `4 M9 c. m9 ~7 N8 k$ ?: T- S& r. R3 S8 T
Round 1; T. q! |+ J5 Q1 S) F# M
Group A vs Group B. T/ t2 L s& w/ I8 F8 e# W
如A and B一樣, 即較輕一粒在Group C or D
1 w' h8 j6 @/ w4 r8 w' r" ]! F8 f) n! R: c) Z# _/ q
Round 2. F- G( w7 B' v* N% f
再在Group C拆成:
0 ^, c. _+ ^1 K: n3 |4 LGroup Ca: 9,10
. z+ P) H3 ?5 ?$ y5 k2 }& r9 pGroup Cb: 11,12
6 T% g7 S! a& ]* R; [然後再秤, 如一樣, 即13為較輕一粒.
# _2 `0 d7 I" p" J
/ Y" `: r3 ?2 r' p, C如不同, 即較輕一組有一粒較輕波子在其中, 7 H: D! I* a$ Z0 [* f
要再秤, Round 3, 之後便知答案.1 X' q3 Z* ?1 y, m7 P# o9 z
- r, @) t6 b% |; f0 I j
e.g. #1 假設10為較輕的一粒
3 _8 n/ C; V6 h$ j8 u+ Z2 [5 JRound 1
' {7 G* m3 V" E, s: C$ U0 o1,2,3,4 vs 5,6,7,8 = equal
8 m g* N2 m; j! @; a- F7 z
+ t0 F/ P& A2 ~; \5 FRound 2
0 |0 l1 h7 e4 N4 Y0 @/ A6 r* s9 a9,10 vs 11,12 = 9,10 < 11,12. A! y% ?- f* D
4 _- f. z# r7 ] B" uRound 3
8 X0 {5 j0 F: d5 k; I3 y" e9 vs 10 = 9 > 10+ v7 `( `; |: X! j! f& l4 j
, G; K8 n' R8 L9 B% P3 UThe answer is 10.
3 w8 D; l7 {8 i% T" d" a( s) [9 T. G1 \* W6 I9 }
e.g. #2 假設7為較輕的一粒: `" C" C+ p* p8 I' S. E- s+ J4 N
Round 1
/ ]3 G5 m" _! ]1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8% K5 j2 C, {9 t
! D1 @, ~" v3 b" H2 y' K9 Y, kRound 2
) m2 o" {5 u q) H( G9 @5,6 vs 7,8 = 5,6 > 7,8) \+ L- \" w# P8 V3 ]0 {
" I( Z' j3 @) P. HRound 3
1 {% U' _$ w4 Z& h# n% o7 vs 8 = 7 < 8! ?2 w K- T/ }. A* i9 R
* V$ k- g1 v! F* T, WThe answer is 7.) H5 R: A2 L) g! o% r+ ^7 x$ }
4 T6 h' J! r( E( N, Be.g. #3 假設13為較輕的一粒5 ?- z% W7 M. K) ]$ Y
Round 1. H. B. H# w9 \ z
1,2,3,4 vs 5,6,7,8 = equal8 s$ c+ M% D% _8 j3 W+ D
( t; }5 K2 j, p& w: ? sRound 2
* Y- _6 B. U r9,10 vs 11,12 = equal. t; i+ }0 ?1 q% D4 h
9 I- G8 u: o6 D1 |9 Y n9 \! Z& iNo Round 3( E) ~% d+ _* D
, E' b! A8 q3 ~. sThe answer is 13.' a/ r- A" E; S; a
' p' i: `: {, d7 h4 \唔知我答得正唔正確呢?! 5 x# O+ Q% L! g0 b
: c( y" q$ H; q2 V' D[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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