hello1997

分3組4隻波子秤
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Group A: 1,2,3,4
, n1 ?. _2 t# ^2 eGroup B: 5,6,7,83 y6 X! x6 H. G' |7 H( v) i+ s
Group C: 9,10,11,12, n# `* Z' e7 D. a6 [3 X$ I- J9 w8 d
Group D: 13
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7 p' b% ?, E  b, P! |2 SRound 1
' n3 M8 i1 ]! [! s3 I; g( L" hGroup A vs Group B
2 s9 `: a4 F2 `2 Y7 R如A and B一樣, 即較輕一粒在Group C or D
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Round 24 I/ [0 w! P3 F  M8 ~8 R8 \
再在Group C拆成:
. B" H5 W5 `* q0 ]4 Q1 \0 ~1 x3 y( QGroup Ca: 9,102 j+ Y' T% f0 x# y  Q
Group Cb: 11,124 |0 i8 S: h$ ^4 v0 ~0 D
然後再秤, 如一樣, 即13為較輕一粒.; I( @" y; W. V: l
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如不同, 即較輕一組有一粒較輕波子在其中,
) c  c" V, ]2 K要再秤, Round 3, 之後便知答案.  r$ }, u6 h% L4 I% y: ]
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e.g. #1 假設10為較輕的一粒
! |& O6 c' {  ~! u9 [) k2 c* p) ]5 bRound 1- K  ?9 Y6 N0 l2 X8 o
1,2,3,4 vs 5,6,7,8 = equal6 E2 n  \4 Q* T# C/ A2 h

0 J, w. x; Y! e$ X. JRound 2
, @& p+ V' b+ S- o7 ]7 o9,10 vs 11,12 = 9,10 < 11,12$ l( i" l6 P  j9 h) f: w  r' d
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Round 3
7 W7 h+ T3 A, u& g* a  m' e; L9 vs 10 = 9 > 10
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% k1 ]4 T9 b* P/ I& U; n  @The answer is 10.
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& }  t$ R! C7 y% M4 u# ze.g. #2 假設7為較輕的一粒/ V8 m' p; i- F$ ]
Round 14 h8 W# Q9 B$ w, k( P- g
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
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) R0 \% H( M8 y& ]7 z/ eRound 2; w) Z$ c4 R1 u( s! W: y: R
5,6 vs 7,8 = 5,6 > 7,8
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Round 3
; _7 N9 G/ {9 b# e/ Q; R$ C% ~5 \7 vs 8 = 7 < 8% G8 @5 x! n3 [6 \8 c
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The answer is 7.
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e.g. #3 假設13為較輕的一粒
: |8 N; }+ M( ]& T5 ]8 ZRound 14 P4 W0 I  g+ X
1,2,3,4 vs 5,6,7,8 = equal
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+ _8 z! Z  @  {8 CRound 2- f9 R* e' ?. n, c* Z; Z/ G% V
9,10 vs 11,12 = equal
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No Round 3
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The answer is 13.% A) ~" A0 P: @# R/ a1 G: r
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唔知我答得正唔正確呢?! + v9 g& o7 o# b5 h) B& j

% ]" P: ]$ `5 K! \[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]