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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
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Group A: 1,2,3,4% s, E# x N5 V
Group B: 5,6,7,8
: |6 L1 C+ M3 zGroup C: 9,10,11,12
7 s# @3 _: f8 C/ e/ Y0 C3 | rGroup D: 13
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Round 1
! a9 V; B' w4 x6 JGroup A vs Group B
* g& T$ k" O5 ~" }% }如A and B一樣, 即較輕一粒在Group C or D
3 k1 I# S9 r% A3 H2 I) x2 b
% _/ J6 t# M4 I0 y KRound 2
8 f* S8 C* e. K9 c! f8 O2 |再在Group C拆成:7 J- S8 X6 I9 c2 y9 `
Group Ca: 9,10: L. h+ I' f, }, M
Group Cb: 11,12
/ J$ z# _4 X* @$ S, g3 T( J; c. b0 z# b7 Q然後再秤, 如一樣, 即13為較輕一粒.
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8 n8 w- P& i3 \9 s% x J7 ?如不同, 即較輕一組有一粒較輕波子在其中,
3 j$ C, m% q* w+ j- _3 @7 G要再秤, Round 3, 之後便知答案.
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: E$ V; O, a. s: p' @) t" ze.g. #1 假設10為較輕的一粒
4 _ s) U0 [8 aRound 1; A8 w$ k3 w$ M! e: d2 @
1,2,3,4 vs 5,6,7,8 = equal
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Round 22 E' G) E7 P) C) U6 N
9,10 vs 11,12 = 9,10 < 11,122 U1 B; r& z, y9 G* W& |
: f7 Z2 e! |3 ?) \8 ~/ L' }Round 3
9 @" J( O' z( |% `; V8 [7 V7 j9 vs 10 = 9 > 10
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The answer is 10.
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e.g. #2 假設7為較輕的一粒
& {9 C; m. k/ \9 }2 r4 x4 QRound 1
0 a9 k3 |3 t, H1 T5 d% v1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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Round 2
7 G/ l% Y. X" R! l$ V$ b* J, U5,6 vs 7,8 = 5,6 > 7,8
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! r1 b' e# R. q2 {$ KRound 31 [! @2 p9 S& w# ]4 w/ {: u8 o
7 vs 8 = 7 < 8" R2 P$ v" F% y# J3 a
; H( o N5 e6 yThe answer is 7.! p' }# |5 U9 D; X
# G" S- w$ i u+ w& \* qe.g. #3 假設13為較輕的一粒7 r: X- f$ n' i6 g; s
Round 1% e' n, N! \* m' d
1,2,3,4 vs 5,6,7,8 = equal
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9 A Q4 h. I$ P, ^1 ]% e4 M" sRound 2, R5 {/ g! n! O# U& W" z2 f, g
9,10 vs 11,12 = equal
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No Round 3! o! N* b0 S& f3 b
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The answer is 13.
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7 ^3 v* M% r$ |" d3 n唔知我答得正唔正確呢?! 
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; m. _5 q) S* d1 p0 p& w[ 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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