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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
6 O* [. E# J' H7 |9 f) w
1 M5 X* @! K6 b* h0 N4 UGroup A: 1,2,3,4
, E, @' V+ x* P( J$ M: L) q) D% yGroup B: 5,6,7,8
+ {$ l; [5 x& l0 ]) |Group C: 9,10,11,12* n2 X5 Z+ W/ G: d& X5 s* O
Group D: 13/ J0 ~) }2 M* N9 j6 x( `
3 C' R# E" A% U6 J5 _8 f7 fRound 1
! n, A5 H& v" v5 e4 j2 `, IGroup A vs Group B6 w8 W+ A; ~* F. t
如A and B一樣, 即較輕一粒在Group C or D
+ q( w% H2 S9 L% Q: i! ~; _: R" I1 _
Round 2
. m4 E) K" r$ E1 m. y! F5 ~, S# C再在Group C拆成:
) U% w; p; H, U8 U8 X) B8 W8 t% k8 UGroup Ca: 9,10+ b/ R2 Z+ ?/ r% R
Group Cb: 11,126 R: j* M/ m" X6 E8 J1 w) H& g
然後再秤, 如一樣, 即13為較輕一粒.
& q1 s1 e. D+ v2 s0 Q, E, a' D9 P M! }5 z6 W
如不同, 即較輕一組有一粒較輕波子在其中,
0 V* e& K8 C4 k+ w; R) ~# ?0 E要再秤, Round 3, 之後便知答案.
5 k" i) |0 p. P$ F0 }5 |. C6 A( U6 j' q6 W& M6 x4 _
e.g. #1 假設10為較輕的一粒
7 l+ K) b7 u6 ~+ M3 W/ g u( _" WRound 1
* N4 u. [9 T. Q, w) o1,2,3,4 vs 5,6,7,8 = equal
$ Z( i* \* P! Y
, u( c( i7 O. D! n' c* SRound 2
$ m4 T9 M& f. a& w" q7 N) {% V: W9,10 vs 11,12 = 9,10 < 11,121 h% m) M5 B! T9 s N' ?2 j) \
; ?- E' X& ^5 @! |1 ], f C; P# JRound 3
+ {- y( @5 r. a( \% m$ a9 vs 10 = 9 > 10
( M, P+ i: I' u4 T/ W$ Q# `( n) v3 q! d
2 `. O, T' N/ M8 M1 FThe answer is 10.' b/ m3 v' d. a) N$ ^, Z% V
5 v& ]; _" B1 Q
e.g. #2 假設7為較輕的一粒
5 w3 H! Z$ ^% }$ Y; A0 l, CRound 1
8 z* I$ `$ e7 j$ h5 D% D5 g% ]1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
7 r. I" Z4 n8 k+ t/ i8 R0 w) P. y: U) Q1 N% B
Round 2* Q* n+ J. M( I" C+ c' s+ X" Q
5,6 vs 7,8 = 5,6 > 7,8) w) i5 O) n9 V, @+ r( T
8 G; x' [2 S# A4 I- {
Round 36 k# E0 T3 y" R1 H
7 vs 8 = 7 < 8( Q) T: ^8 P; H/ j1 M
8 N: P: H* A" S7 r0 R
The answer is 7." Z; o* `5 s4 {
M: f# b; ^0 f: \ P1 l! Xe.g. #3 假設13為較輕的一粒3 @, R& B6 N9 t0 k, Q
Round 1
! |7 f5 J- {2 R- z1 n1,2,3,4 vs 5,6,7,8 = equal- }' B, _" J/ Q% l
9 s- q& _, c$ `/ E/ g6 B, E6 t3 fRound 27 S5 y6 m/ B8 M0 M: |7 r9 P% |
9,10 vs 11,12 = equal$ U( T) |* T) S% u* K% G' x* U
( \1 f' J6 e7 XNo Round 38 z8 m% y4 r; e2 k
- B3 O, h3 n- A5 B/ ^/ }0 W' ZThe answer is 13.
" U7 E' J) ]* H" X4 n x J; s0 u- k, T& L" X+ N7 u/ I
唔知我答得正唔正確呢?! 
! y0 H! ^, X5 m4 i, b4 f z! g+ Y' o+ C# D* A- G
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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