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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+ W0 E; @7 @& E8 c0 | ?
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Group A: 1,2,3,48 K$ k7 J1 T! T2 B8 p
Group B: 5,6,7,8
7 l9 u$ w! Q) c, eGroup C: 9,10,11,12! N5 }/ ]; y6 @4 l3 \5 ^
Group D: 13
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Round 12 m- f; S# n) [+ C3 G8 B7 I$ o4 o. I
Group A vs Group B
, L7 v; K J' _8 a/ K如A and B一樣, 即較輕一粒在Group C or D' B2 q9 n z5 o! n" c
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Round 2
3 Z5 h; r. ^( u, S3 [- o再在Group C拆成: h f5 ? N" U: T9 G# S
Group Ca: 9,10
5 g1 A R- a4 w0 t" CGroup Cb: 11,12
( o: X$ y/ R% o$ g [# g5 D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,
# W* q6 r- o7 f' a; {& N4 K5 B要再秤, Round 3, 之後便知答案.9 w( j" [0 `7 T- D4 o+ u
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e.g. #1 假設10為較輕的一粒
% I! r% s$ R' [% s" o# kRound 13 R" D- d: R4 Q
1,2,3,4 vs 5,6,7,8 = equal, W; Z' w/ S0 o/ d
0 r' E# x$ x5 h1 fRound 2
7 I3 k/ ]+ M0 F7 l9,10 vs 11,12 = 9,10 < 11,12
7 [& I; G: a8 I9 p7 H7 |0 ^/ w! x3 e, m5 e/ h! j' w' g% m
Round 3
7 \& v( _, p; E; @: |9 vs 10 = 9 > 10! \- B! a8 V+ a) K) h8 C& j5 C
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The answer is 10.
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e.g. #2 假設7為較輕的一粒! D# h# u9 F0 y+ ~+ t' X
Round 13 K" \- F% b2 L9 O! |2 P! Y
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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/ @) g" p, ]1 T9 ORound 2
! R' W, Q. C2 L+ K. R- _5,6 vs 7,8 = 5,6 > 7,8
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+ N$ t; G( n+ f' s/ L! YRound 3. l, ]8 g1 h) ]9 W; Z; {
7 vs 8 = 7 < 8" L3 H) ^% u' r9 U8 L! }
- \# s, B7 V0 U0 }3 }The answer is 7.
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4 r8 d. B5 B/ \% y3 X+ S5 f: L" le.g. #3 假設13為較輕的一粒
3 \8 F2 e# }5 l/ a5 g/ tRound 1
) y9 Q; \/ z+ a, B3 S1,2,3,4 vs 5,6,7,8 = equal9 D) x/ I" j/ g# ?% `/ a
4 s; m( p0 M* x5 y; N+ a' A
Round 28 l+ h, D/ L4 H& j/ ]! Q
9,10 vs 11,12 = equal/ l9 ]6 c8 ` O5 R$ w" v
7 }4 p, s3 a3 C! ONo Round 3
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The 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 ] |
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