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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$ |& w$ j3 e2 [0 u* ]
3 @" a/ {; b3 Z+ F5 m+ n
Group A: 1,2,3,4
- |# D2 Q- d3 U, W2 ^' h( oGroup B: 5,6,7,8
8 I* e& v* H5 A( S3 o: xGroup C: 9,10,11,12
0 u2 }: U& F) B# I6 X5 t, b7 |1 wGroup D: 133 Z& D+ X& L! Q7 c" o
; T: `# G3 b6 B* Q# s U" [Round 1: n W9 s# P% t+ ^' w
Group A vs Group B& N4 `& v$ D4 ]) N* a0 K- I
如A and B一樣, 即較輕一粒在Group C or D
0 w7 W5 |7 _2 _5 Y( b9 n: Y1 V- _
$ p' @# I" r; y1 B% jRound 2& s+ a! @7 B6 \- e
再在Group C拆成:8 s( D- i0 t3 ]9 B! ~' f; g
Group Ca: 9,105 J3 F0 C8 M1 P, I$ H4 i; B
Group Cb: 11,12) G7 x) i$ A4 S, H. A# l) Z5 _
然後再秤, 如一樣, 即13為較輕一粒.
# W3 Y. k$ r9 S8 O1 Q4 t! L7 [# P0 H: O
如不同, 即較輕一組有一粒較輕波子在其中,
7 |# {& `$ w$ S' c: {* Q要再秤, Round 3, 之後便知答案.5 z" |* M) D1 ^; U# U
$ @: T t% ]* M8 R% fe.g. #1 假設10為較輕的一粒
7 r4 o: G5 J7 `4 X: r$ H ?& sRound 1
( R n; a, p0 m4 v! n1,2,3,4 vs 5,6,7,8 = equal/ x2 l1 ?7 _6 q( X. L3 e
$ A H6 ]! a" D) B ^( t* gRound 2
. }! i0 ?/ n$ @9,10 vs 11,12 = 9,10 < 11,120 `6 w6 \: N/ h( v9 [
; [- Q# h' b' v" wRound 3
: q$ O, n- k- P. ~- r$ W; o8 ]9 vs 10 = 9 > 10# I' |' z6 s2 l2 }/ T
- W% Q2 b1 Q0 Y/ FThe answer is 10.
: \5 O: d+ {& t) ~$ x& N5 s: h2 K! v$ t
e.g. #2 假設7為較輕的一粒
: z. ~# P2 B; _, f* Y" p% ], J9 YRound 15 X F% y0 E0 |0 L6 e8 p5 D3 ]
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8) r* b/ J# A* ~' W
/ z* U$ @$ O2 E; f* T4 d9 {. LRound 2
8 c( Z7 @+ [8 y5,6 vs 7,8 = 5,6 > 7,8% q, x+ a5 E% m3 [8 ~- A
& |( E- X- ?* O" D }- d& gRound 35 e0 Q) `5 Z, E3 H* z, V2 l" |- d
7 vs 8 = 7 < 83 c8 r( @ {6 i( k7 r
* n4 a6 n- l. B! zThe answer is 7.
; T, ^ b& E' V: Q9 r! E1 J! e9 R: m1 \* P: G
e.g. #3 假設13為較輕的一粒; [# r3 n) e% S- f8 A5 j+ t2 W
Round 1 ] q' K N: j2 ~) M+ O6 K* m
1,2,3,4 vs 5,6,7,8 = equal; [$ q6 m1 D7 ]$ {, k
9 ~& A8 v. L, H ~
Round 2
, {- w0 c$ z% O) P+ j/ `/ ]9,10 vs 11,12 = equal& i5 t5 R- y- ]- o7 k
: j- i3 V' A, Z8 r5 f6 n) S
No Round 3) r& q" B9 O% c0 Y1 f
( A+ B5 Q. h$ d) j1 s* b0 U
The answer is 13.
8 p% R4 x" K. v7 _) g6 B0 v* r2 y2 x; E, e- D% T
唔知我答得正唔正確呢?! 
~8 \% k/ d6 X/ h# d P- N! A0 I* v+ h+ d6 M" _8 s
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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