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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; ?3 S/ ?4 F: b
. g+ V+ I! c$ \. h, \; H
Group A: 1,2,3,4
* q- i( |( a1 P T- k1 s1 ?* UGroup B: 5,6,7,83 C7 e, n+ y& I7 n2 Q* }# G
Group C: 9,10,11,12
0 c1 `& z$ Q4 i5 b" \6 RGroup D: 13: [6 L; f4 U" A1 T6 P5 X; M2 L
9 b" v! z3 ^" Y GRound 19 _/ W U, s k' R
Group A vs Group B$ P- D( M3 p/ e! v& ?2 A3 c
如A and B一樣, 即較輕一粒在Group C or D, i7 W4 T% @# K$ g( [' {. }0 R
* E9 L Q% j1 `! P& wRound 2- S1 Q6 N0 i, v$ [0 a/ p( C
再在Group C拆成:/ D4 o& n* Y2 B" c: H9 J1 l1 o
Group Ca: 9,10
# Z. ?0 r9 b3 X' J7 l7 m- u: {Group Cb: 11,12: _+ w9 h: k7 u! z
然後再秤, 如一樣, 即13為較輕一粒.) A/ d5 |* H+ u% {" e, U- [
# i# K# Y% h: Y! E
如不同, 即較輕一組有一粒較輕波子在其中,
8 P8 I: j+ R( J/ H! }1 C要再秤, Round 3, 之後便知答案.
^. M( |! ~$ s8 L) U8 ]% \$ u8 |1 R. @# _) e
e.g. #1 假設10為較輕的一粒
9 w3 r* x, {; V% `Round 1
: S& V: l7 V/ v5 m/ Y1,2,3,4 vs 5,6,7,8 = equal M2 E4 V, P2 Z* f' w6 l
5 ]7 }5 Q5 M* E% E. A! F' KRound 2$ a9 }0 Q, y E5 y, n5 |9 p* t
9,10 vs 11,12 = 9,10 < 11,12
# E7 [7 i* _4 Q! G. q7 S/ |
" o/ k. v6 ~% W, T. }8 cRound 3
3 \ C$ n+ ~9 |" \( h3 X b3 J9 vs 10 = 9 > 10
1 g# ^6 W# }; ~) P7 g/ q& u; v8 B3 x3 i T: `% z
The answer is 10.
: t* {; p6 v8 r7 M" T# l
! `& I! A* B& x9 }1 B7 Ne.g. #2 假設7為較輕的一粒
; u' K$ o+ L: w& l8 PRound 18 A2 Y. D) _6 ^; J
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
' k) T I. P: o, P% f
& S O0 b" }) oRound 28 [9 l# r* W: a% Q' P
5,6 vs 7,8 = 5,6 > 7,87 t- Y+ I" Z. I. S
: X! Y* v [# a; h, s, s6 ORound 33 L' x5 ^- N- R8 P9 ]& u/ C) _* d
7 vs 8 = 7 < 8
: J3 v- f U# S. b5 o+ i) A$ b5 }8 |3 [# [9 h' K5 A5 L
The answer is 7.
% P+ J/ Q. ?" ~0 I9 }' m7 a' `
6 o# e1 Y: B1 [: n9 Ae.g. #3 假設13為較輕的一粒. l; S; M5 G9 e0 b c% ]; ?
Round 1
- |# P& X" z0 v5 S3 t1,2,3,4 vs 5,6,7,8 = equal% v. y& Z) b) i
. }/ u* o7 X/ |# ~0 b% tRound 2
, T9 y5 g7 }# m; d& T1 f9,10 vs 11,12 = equal
4 K3 R( T# j2 n; U% h4 e4 ~2 o
0 R b- Q7 _& N, WNo Round 3
1 c S0 w8 J9 O4 N& A
$ ]$ y# r* d/ l OThe answer is 13.. M4 C) m1 c' [: |' [% D9 b& H
: Y: `' e+ z' Z6 x
唔知我答得正唔正確呢?!  , d$ p. y9 o" x
{8 w; P3 a+ S9 ^% L4 I1 S# M[ 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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