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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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( I4 K: D% f+ _2 v% uGroup A: 1,2,3,4
) b; g! S, H" a3 [: d% yGroup B: 5,6,7,8, }! } X: [: }; G! S/ m6 O
Group C: 9,10,11,12
" a) r3 S. @$ l6 bGroup D: 135 o, C$ }& L: ~
: X" W& W4 `: R5 H! [/ M* `Round 1
! C, S* }+ ?# ?8 _6 A& x- kGroup A vs Group B
" {5 e3 t( H% \7 S8 m! k如A and B一樣, 即較輕一粒在Group C or D
* x( r+ |! a: H+ F y7 X
5 S8 X# e( Q( x' }Round 2
" Q" I( [5 j* R) g再在Group C拆成:
3 F- Z1 J/ W. R5 C3 ~3 E9 r* g5 S4 g( ^Group Ca: 9,10
# [& G( h$ R1 I/ g3 BGroup Cb: 11,12- u* U8 S! A9 ?4 h) ?9 v
然後再秤, 如一樣, 即13為較輕一粒.' K3 p8 H& w. S: w: Z8 C
* t; s f; u- P f如不同, 即較輕一組有一粒較輕波子在其中, ! l$ s: x/ z( U& w* r* U/ m+ W
要再秤, Round 3, 之後便知答案.2 ^6 L4 o, z/ u, P+ k
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e.g. #1 假設10為較輕的一粒
- v! H) o5 J3 S9 k. ~7 J. m; }Round 1
0 @9 ^) G& j& ~ V# J1,2,3,4 vs 5,6,7,8 = equal9 Q! @( D ^0 k5 B, o
! q7 A6 W' ~* h+ a3 B1 g4 v7 C
Round 2, Y5 W/ `9 I9 A3 w( [( a& z M# b
9,10 vs 11,12 = 9,10 < 11,12
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Round 3
9 f' i& y1 |% W+ [* T9 R# R9 vs 10 = 9 > 102 c U2 v1 q8 F3 J# `8 x) G
1 z& n5 z" m x, E2 a3 s# c$ bThe answer is 10.
0 E* N5 o1 E$ X+ ]+ G, R9 p
& o" |1 H r9 Xe.g. #2 假設7為較輕的一粒
/ i* I z6 e& `3 d) `+ n3 A! M3 kRound 1
5 H! U2 Q2 P `" r, q1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,88 Y+ s3 i2 z! ?
0 ]6 Z% K" C6 j" x l1 U: ^Round 2$ Y5 t9 d3 ~) @5 h: R
5,6 vs 7,8 = 5,6 > 7,8- l" x0 ~ j ` X# c2 i
# F; n. |5 R2 B
Round 3
. U& x: J" a! u' @7 vs 8 = 7 < 8
! E' o5 }/ w \. B- o/ Z. { J+ V4 \, a4 Y
The answer is 7.
s8 e: ]9 G0 I
4 }6 S3 n# V% Q4 ue.g. #3 假設13為較輕的一粒' U G# z8 q$ W2 R5 I4 z
Round 1
( @% z H) ]- g/ M* `# z+ K1 v5 g1,2,3,4 vs 5,6,7,8 = equal$ O( Z9 |$ R. E: U/ U7 p
% f' I6 `/ G) C0 yRound 2
, i/ b" [: M* P6 W5 F, X, F9,10 vs 11,12 = equal
6 v: z/ L) [* z2 ^" s4 b( N7 e! U; h) b, f; N
No Round 3; X: l* `" x+ Y, {2 L, \/ q; H
2 _3 S3 `' a) \, E- w# aThe answer is 13.% Q5 m7 h [0 H L
' _' ]7 M! M# S! N% @4 `! ^$ q
唔知我答得正唔正確呢?! 
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8 d3 Z: g9 a6 D1 G, x[ Last edited by hello1997 on 2007-3-2 at 12:39 AM ] |
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