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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1 \1 v3 D5 c# f: x% t- k
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Group A: 1,2,3,4& d" s& Q' j0 [6 i* G
Group B: 5,6,7,83 N9 k3 I+ K9 \! r! A S8 ?$ ~
Group C: 9,10,11,12 d9 ^" _( m# A# D! C5 `' I
Group D: 13+ s5 H6 c) w/ _# l
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Round 1
* g* {1 Y! n0 N9 a: SGroup A vs Group B% d5 g. z% }. \. Z4 H
如A and B一樣, 即較輕一粒在Group C or D6 a6 K' x7 V5 J/ c0 F
) `1 F4 L+ }7 ?: b* M5 ^7 M
Round 2
2 m, E# G% C. i0 |5 }# n/ _) l7 [再在Group C拆成:, ~# B$ Q8 ~* d# ^9 w( V
Group Ca: 9,10
" w2 E5 p) v; P* H6 x fGroup Cb: 11,12
. Q) d$ Q& ~$ s然後再秤, 如一樣, 即13為較輕一粒.% Q! p3 h% E4 f4 o: C
* S4 w- F% Q% ^: D
如不同, 即較輕一組有一粒較輕波子在其中,
2 W) w4 i0 e3 z+ _要再秤, Round 3, 之後便知答案.
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: u7 d6 N0 c0 j; }2 he.g. #1 假設10為較輕的一粒
2 G+ r& v; L' U c+ E# q; z; ~Round 1
! E7 `8 x2 ~$ ?* l+ d" h% v1 ^1,2,3,4 vs 5,6,7,8 = equal! Q; |) L7 i5 m9 N Q& Y9 m
& {$ d" P$ b9 `/ Y3 r
Round 2 i" E& W2 X2 r. T, q3 T- x
9,10 vs 11,12 = 9,10 < 11,12
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3 Q, R$ ?$ ]3 |3 @5 {) f/ dRound 3: T# [& q0 W+ E
9 vs 10 = 9 > 10% A& o- @ G8 e+ n& W
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The answer is 10.
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0 z7 |0 b1 B0 f' y# W1 ^3 ye.g. #2 假設7為較輕的一粒5 C, D# a+ s! a3 e. W! `3 ?& b2 h
Round 1 n2 S7 f& J. W. n2 Q: R) |
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
# ]3 I q. Q# B; ~" H) k1 c% v0 v! L+ g) V: c' ~6 W$ k
Round 2
( a. r. f8 U7 n/ S& i$ s: f5,6 vs 7,8 = 5,6 > 7,8
2 w) R2 z7 C A$ q+ a. N) ?" h B& j F4 G1 k* d" G8 f
Round 3' L: Z* [( d; u% U4 k
7 vs 8 = 7 < 8
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The answer is 7.
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e.g. #3 假設13為較輕的一粒( N$ b Y# \) q2 h& J m
Round 10 T0 A$ K: Y& ]1 Z
1,2,3,4 vs 5,6,7,8 = equal
7 r6 U& W+ R- S# S
& o0 ^. Q& Y! I; Z4 o2 b8 o: BRound 2% s5 \1 u) b( R; H8 v* a* z
9,10 vs 11,12 = equal
$ M3 s0 n+ f; N( J5 B
U1 L) S, T: e+ ]0 gNo Round 34 h) X0 W; e4 v
, d( s$ N4 M$ x# K4 f# oThe answer is 13.
, ~' }, e; K3 y$ L. \. w' _) T w. h9 |' O$ U0 \4 m, ^ S* z8 q. _1 U9 M
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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發表於 2007-3-1 11:57 PM
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