hello1997

分3組4隻波子秤" C- q/ I! F+ c$ i1 f& N5 h3 d  N

/ b( P6 e% P6 C, w, v+ f0 zGroup A: 1,2,3,4) e. h" G& c! v& l" X# v' j
Group B: 5,6,7,8
" b+ J; t. i0 d, Y2 A! JGroup C: 9,10,11,12+ u! ]0 e: z4 o: a' U/ \  V% k
Group D: 13
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Round 11 g6 W7 e- A2 Q: ~& Z/ O
Group A vs Group B
& k/ H  p, o+ k  ~: D$ T( H如A and B一樣, 即較輕一粒在Group C or D' W4 x7 ^. ~& x$ n  e: z% @

' c/ {" W' s( T6 @" C' SRound 2
0 l( z, X4 d& K7 x再在Group C拆成:
8 a! v# D; D% H' E+ S8 L4 ?/ U) v3 YGroup Ca: 9,109 f5 Q- ^; }# G3 B
Group Cb: 11,123 p3 @  ^/ N( F2 q8 w& m& O5 @+ B
然後再秤, 如一樣, 即13為較輕一粒.
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如不同, 即較輕一組有一粒較輕波子在其中, 9 I2 ?1 F. n; w8 N8 h8 [1 {6 g
要再秤, Round 3, 之後便知答案.  b' l6 w5 I, z/ ?1 Q, K1 ~
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e.g. #1 假設10為較輕的一粒
$ [; I  z; H5 yRound 1
+ [0 A$ |! s9 C& g1,2,3,4 vs 5,6,7,8 = equal/ F8 A, k$ X" O

2 e" p7 f& m" ?6 `! I, HRound 2
+ r. B$ ]1 `7 |7 i% ?8 w4 I: s/ ~9 R9,10 vs 11,12 = 9,10 < 11,12( {* i+ s7 F- K4 a; Q4 e5 `7 }* ]
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Round 3
  `9 g: w' Z: c. E% F8 |: `' m9 vs 10 = 9 > 107 d+ x5 l7 r$ n/ D; |. Z0 P

! H- @" s; p6 DThe answer is 10.
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e.g. #2 假設7為較輕的一粒
0 C4 S/ B9 n( ~; F: tRound 1
. J; }( s6 X. N% {. W1 E- W: K- [* O9 X1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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: _' r" E  y8 t' d% ]! z- U3 {Round 21 ?% i0 t( O: s( R) g
5,6 vs 7,8 = 5,6 > 7,8
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+ u. }, x: R2 ]- s* C9 y- IRound 3
4 j; F) l, r* R1 c, D# M4 x7 vs 8 = 7 < 8" @% W5 _+ q: a

9 n: J0 {" M" ~) C: C1 N/ I0 dThe answer is 7.6 s+ ~* a: _8 c$ s/ _8 C8 A" s  X

& m& A2 c$ o: ^" le.g. #3 假設13為較輕的一粒
, K- I8 v5 `5 K4 J2 _: Z2 nRound 1% m0 U/ U' p4 N' O& l" D- w
1,2,3,4 vs 5,6,7,8 = equal
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Round 25 D2 S$ l" R& S. H5 W2 V
9,10 vs 11,12 = equal" c" E  z4 j+ x+ n. y

/ x7 Q7 E  N6 {  KNo Round 3' M9 \3 K4 i( C; |/ Z! ?, y" {5 ]

$ P4 N6 _& A( Q  {- }/ b: U' GThe 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 ]