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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( ]# t4 O! u, z1 g, l
' I5 k( b: P5 H8 {$ l1 y3 \& F8 |0 Y
Group A: 1,2,3,46 J$ e+ s. a2 I e- ~
Group B: 5,6,7,8
* O/ O- S0 `" j& G. _4 OGroup C: 9,10,11,121 P( a% ^, W) j1 {* K( g
Group D: 13
# r0 H3 R: e0 ~" j1 G# v
3 X" O* m7 ]4 a. dRound 1
9 j) ]) v9 T) ~# T' O6 S# o" _Group A vs Group B
4 j5 K% `, h2 o9 U( i; w) N% j如A and B一樣, 即較輕一粒在Group C or D
$ U( X- o/ T/ N0 N+ A! O4 U5 _# d- f* ?# f" `7 c
Round 24 I; v) l+ y$ h# x5 c
再在Group C拆成:
2 d. d0 t _+ _" N! W) ]Group Ca: 9,10/ r4 A2 v# v H+ @/ P
Group Cb: 11,12
( a4 }* V5 ]4 e% [然後再秤, 如一樣, 即13為較輕一粒.
( g7 h I+ F6 P7 q0 n/ n' E, K
5 m! K/ S; A6 f如不同, 即較輕一組有一粒較輕波子在其中,
( b7 p0 r) A, q. O" K( Q# E" d. x要再秤, Round 3, 之後便知答案.
- i) s8 T$ U4 h; h. U
5 v: k7 l8 D y2 r+ Q- p% Ie.g. #1 假設10為較輕的一粒
) ^8 d. J) _. c! ^7 S5 |& WRound 1
9 o( {/ U2 b0 V1,2,3,4 vs 5,6,7,8 = equal
! r# [! i! J- _' C' B# ]! m% }+ ~ r- C/ ?* ?
Round 2
% U7 H t: W+ S, U9,10 vs 11,12 = 9,10 < 11,12
" C# f7 [) B' Z' i% x* ?( i8 R4 U! p0 v
Round 36 P$ |$ H: @2 {
9 vs 10 = 9 > 10
) Q+ d2 ~7 X4 Z2 z! Y" o
! ^; C5 Z+ r, u$ y! S8 k+ FThe answer is 10.
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" ?# r. E. @% S. b6 V$ De.g. #2 假設7為較輕的一粒- B8 P8 H3 S2 U& c* H8 m+ W
Round 1) \6 L! r. b1 K% g: l, W
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8( Q0 x$ P' r' W8 L7 v9 l2 n
5 [$ j) l" b8 b' n- D. wRound 24 F4 e5 c: p, F' v
5,6 vs 7,8 = 5,6 > 7,8
8 z6 i; J2 m0 `7 g( f
! `9 E; Q, y t7 F3 ~$ TRound 3, I, |, u1 F5 g a
7 vs 8 = 7 < 8" ^3 E7 g; F( [0 d5 F
2 P" o- x! F+ N$ M1 JThe answer is 7.) Y, v8 u1 t ?9 V. a9 T3 X
* b3 T, h* ?. A8 Q
e.g. #3 假設13為較輕的一粒2 o, H- ^( `) k$ c! p h
Round 1
4 [7 Q7 G# g) G* ^3 @1,2,3,4 vs 5,6,7,8 = equal! |: u5 l9 { n8 F! a8 P. Y
0 u% c' `. j( O3 n9 FRound 2
- h* x& @3 N, k" g L; n5 P% }7 S9,10 vs 11,12 = equal
6 U! T; G5 u5 f5 r2 \
- y4 @$ V/ K9 T0 ], U0 i" c. HNo Round 35 N6 h1 S8 w6 w/ K% q$ y
/ Z0 @1 m3 t3 w: N0 O" @* X
The answer is 13.
* m) c, x; s3 {, O3 Z
% ^. m# |7 o6 Y/ V' x# ]) j唔知我答得正唔正確呢?!  ) O! f A* G A2 J
6 L. |2 p8 c' S n[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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發表於 2007-3-1 11:57 PM
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