hello1997

分3組4隻波子秤8 ?5 x3 U3 d/ Y, o5 L% C6 Y# P8 G

, m0 U8 a: y4 ?, f) _Group A: 1,2,3,4, C) Q" A  i* J- M$ t% E, Y
Group B: 5,6,7,8
9 O/ j- Q. p" ?% O# p0 oGroup C: 9,10,11,122 X& |* U7 c5 p( D8 h- V
Group D: 134 f. c8 `8 ]& k6 Y* E/ M

5 k9 [$ b3 _3 }4 B5 WRound 1; E2 M. d+ L  B" R* {
Group A vs Group B
, C4 d& B: X- V$ ^8 w9 u如A and B一樣, 即較輕一粒在Group C or D
+ i' z6 C% e1 {( A1 M) C" a
( t0 b% a! _; G8 a; t! [9 w' n" LRound 2
7 I8 i& k! |6 O6 C再在Group C拆成:3 S- t7 N) C' C, c" e* M/ @
Group Ca: 9,10
2 \) b! Y  _8 p8 L) u* FGroup Cb: 11,12- `- m- c8 E4 O( c1 k+ h
然後再秤, 如一樣, 即13為較輕一粒.* X: F6 c/ H! s/ {) }0 ~$ N
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如不同, 即較輕一組有一粒較輕波子在其中, 5 n, y6 D  M  n- b' c6 j1 u
要再秤, Round 3, 之後便知答案.+ u$ @1 j2 S9 ^0 S: \8 }1 k

3 Q  }  P% o' a( z/ t4 se.g. #1 假設10為較輕的一粒
( \9 j( W+ \6 u4 z  x  G3 c0 [% u$ o' |- }Round 1
. R7 k( f6 y/ Y' @% W' W2 j0 i; C" e1,2,3,4 vs 5,6,7,8 = equal
0 Y& n5 e! @9 r3 `5 O% b1 ?, k  i4 \1 \3 m
Round 23 M* G: C4 l: Q- F8 p# M
9,10 vs 11,12 = 9,10 < 11,12. ]0 @" [8 k. m5 u4 r5 Z
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Round 37 ]% |/ ]7 [1 l8 S$ w
9 vs 10 = 9 > 10: k# a" G# _+ y' T0 r

& f6 E* h3 e! X  S: QThe answer is 10.' }* ~/ N, y+ |/ ]+ j

; _6 W$ b5 k  {e.g. #2 假設7為較輕的一粒1 O* A& t2 J& l6 V, p2 j
Round 1
% q+ M/ D2 B4 a1 K- r- B1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8- |: f$ ~- f  C, q
  W0 l& Y# X+ C( M- U( C3 J
Round 26 P- E4 _8 t9 }( B- t% U5 |
5,6 vs 7,8 = 5,6 > 7,8- |4 J" @" T# Z7 ~+ w

/ w; u3 h9 ?' |" P6 p+ H, `3 IRound 3  L9 b) v: V+ J8 G4 I: [6 i" p
7 vs 8 = 7 < 8
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. t8 o* M; i4 K$ u5 F9 v; QThe answer is 7.
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# j: o( {' l3 Y, |: y( w0 ^e.g. #3 假設13為較輕的一粒1 L) p( d. V# k( }8 M8 y
Round 1* Z, I) i/ l9 S" ]3 f* l
1,2,3,4 vs 5,6,7,8 = equal$ N' K3 N7 C7 v" C& M$ a6 A0 E8 _6 r

9 j) h4 |/ w8 V9 c8 ERound 2
( B* b0 [" c: I6 M9 b3 S) g: \& g9,10 vs 11,12 = equal
7 a! y2 n' t; A0 c' o/ f: i* }0 ?. e+ o
No Round 39 d, U2 Y4 b0 A. s

4 h( i9 e0 E: Q% q, H  o1 eThe answer is 13.' m9 Q. u2 D+ F* r: u7 s; W+ m

% L% n, E3 s5 [' Y0 e唔知我答得正唔正確呢?! 0 t/ N4 T0 _* {

7 @- x. e4 p( l* o/ h# W9 S[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ]