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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& G/ y+ j4 }! N, P
- M* X" X W% S
Group A: 1,2,3,4( b! {/ V# H" g) Y' `9 F( U D
Group B: 5,6,7,8# q+ [% L* O0 A- U9 w5 t
Group C: 9,10,11,12
/ A: f4 m1 ?; V( Q' IGroup D: 13
- n: D* r$ i; F5 Q* o8 E* e5 g! F9 e% M2 }
Round 15 V" F4 u* l2 j- k, d
Group A vs Group B
. h' d+ s! x+ ]4 \6 a9 ^, l7 i如A and B一樣, 即較輕一粒在Group C or D
0 e& k% W3 H% [: {, r6 i* e6 ], {& o( W$ s' w2 j& _$ l c3 A! L
Round 29 Z. B4 d+ f! @
再在Group C拆成:
3 w. b1 T$ o. c% H* @# sGroup Ca: 9,10! p( G6 M* K* {, Y/ u! R
Group Cb: 11,12! ?4 r3 G# m' `: e$ s: l( M
然後再秤, 如一樣, 即13為較輕一粒.; D+ e" G* k. e- e5 X
3 j1 W( [* z$ O' h如不同, 即較輕一組有一粒較輕波子在其中, ) h. q) o" `2 y- k Y- E
要再秤, Round 3, 之後便知答案.) y7 y' b( \) P1 c. f: \
, [- W8 I( B* O' o
e.g. #1 假設10為較輕的一粒" M' I: j! w Z# S/ `5 {
Round 1; v4 C3 P3 j, }# D
1,2,3,4 vs 5,6,7,8 = equal
$ m9 Q h3 R( `% y! g
, |' e0 w7 F: b; F Z8 j- zRound 2
; A8 f" D; S& e9 M9,10 vs 11,12 = 9,10 < 11,12
" j" a3 G. C2 H$ D0 b( s' ^+ d: ^1 _1 M j3 R' f
Round 3
: C/ I8 N! Q3 }' L9 vs 10 = 9 > 10$ N! S& @: V) W
; B" k6 B7 Z, H; T K n) {1 N
The answer is 10.
4 E+ e; j! t' u; I- L# o1 Y+ Q# ]! }: A4 o
e.g. #2 假設7為較輕的一粒; W4 S6 O0 T6 Y+ J8 Z$ O& O
Round 1
& _* T, p; p, j1 M& }1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
6 Q' b, z, Z% f5 n9 j! K# Q
s, v r# f+ P G% s% WRound 2
4 I6 R/ W* E' M! q1 d3 m5,6 vs 7,8 = 5,6 > 7,8
( g9 j0 X5 T2 ?# T' ]' U# T3 {4 Y8 K+ z, c( F
Round 3
; W1 U9 |6 E v6 w7 vs 8 = 7 < 88 H& a9 ` ?! i/ i8 n2 a4 X
5 F- J. w l/ DThe answer is 7.
& X# d! d& M8 |! p4 v* D$ J0 r+ O& @0 o7 i! a4 O3 z$ i& Z' `
e.g. #3 假設13為較輕的一粒
, _3 l8 M% Z, ? B8 j- k1 A1 U" c# YRound 1
' Q0 f, Z) m% N1,2,3,4 vs 5,6,7,8 = equal8 j6 a" h% T0 ~1 l; L e
9 u9 b. b3 s" n3 S s) h
Round 2+ T v: L" o8 ]; j) P/ d0 I9 P$ P
9,10 vs 11,12 = equal
9 F5 Z) ~9 c5 x' Q; C y4 a. y
* o" _8 q7 n8 MNo Round 3
m" h9 S$ ?! U' o) q. O& W1 x" V& g f4 v. m4 c8 k. }6 x
The answer is 13.8 ]3 V" k9 C5 D7 n0 ~# ]6 e9 A! s
6 m. A9 x( }) u6 ^5 Z1 N唔知我答得正唔正確呢?! 
9 u- O9 B& o: q6 g% ~9 ~0 ?' l; @1 G$ n+ \/ w' |: E
[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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