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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9 Y8 n, I' s* K# F
. a) X' C0 s- }; y( C
Group A: 1,2,3,4) `5 Q5 m7 Z2 Q0 w1 K
Group B: 5,6,7,8) ^5 J5 i. ~. `/ x+ X1 x
Group C: 9,10,11,12
" Q# f) y" y- z3 _Group D: 13
) F, U& w4 a7 f5 u) c" S( A; G( j6 u5 P5 {( i; d: C
Round 13 e- h# [, U& ~* Q3 P
Group A vs Group B
* w- [6 @* u$ E$ K, Y3 _- u如A and B一樣, 即較輕一粒在Group C or D- [1 ^4 S( A( v7 O' \( s0 n
' W- m% R, A- |5 CRound 2
1 m7 ~! V) w5 |% m% Y, K再在Group C拆成:8 U/ E8 Q+ r( M; `) F: F+ T
Group Ca: 9,10
N( }4 B. b% L- g2 J" m9 z% S, m7 zGroup Cb: 11,12/ b' N! s; ^( a: [! r4 U- M
然後再秤, 如一樣, 即13為較輕一粒.) {. p" S# ?' P! z
- A5 i/ a, y' {9 g' e如不同, 即較輕一組有一粒較輕波子在其中, # E0 C3 m5 E. L* {( J, p
要再秤, Round 3, 之後便知答案.8 b! C. Y' t7 x
. a: r& q$ y1 B7 K# O# r: J+ w+ r e; I' R
e.g. #1 假設10為較輕的一粒. m! ]# R: L/ Z9 K8 y
Round 1
% i3 k1 G! H/ }4 c1,2,3,4 vs 5,6,7,8 = equal
5 H0 }! G$ Y8 a. m, @
% K. o0 J2 q, g; ^, h1 o. p! RRound 2
2 ?6 Q o# w0 c9 R9,10 vs 11,12 = 9,10 < 11,12
2 I+ ^( d [4 `) r3 P( o
# u7 h/ l0 b7 t1 B% o+ t: m3 w8 PRound 34 O6 X9 u2 T6 m9 w; W! X, ~5 ~
9 vs 10 = 9 > 10
- N$ \+ N( J! d; o, d
; a! O. d( {; W+ ^: jThe answer is 10.4 o0 r4 t; Y9 R( |% l! v/ L
) I1 ~4 P. D# g0 a- I/ {$ ]: ~e.g. #2 假設7為較輕的一粒* |, N3 ?) I$ a
Round 1
0 ]& ]0 K9 S0 M# z1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8& I# }2 m9 s; Q# {
, b( \1 P+ n2 q& X/ g) \1 D: ^4 [( p
Round 2, v3 r; s, W: b
5,6 vs 7,8 = 5,6 > 7,8
/ S7 {7 V. N- y+ @6 w0 L3 t, @0 Q2 A4 ~+ ]& G3 V, b+ ?/ B
Round 3
/ A5 V$ W( K2 `5 p3 n0 e( A7 vs 8 = 7 < 8- L" L& k. n% |
$ o9 ]: J' c' R* a% S2 G3 R dThe answer is 7.: P$ e0 m* I& S( [* o+ q. A
& A+ Q3 ^ c: T$ O& }# _% A# ?+ i8 Ee.g. #3 假設13為較輕的一粒0 k( W i6 u2 ], X# t6 m
Round 1' k! S* Q5 m) r
1,2,3,4 vs 5,6,7,8 = equal
9 U4 x g2 q0 y) A5 U: B# b7 ?9 A7 X5 G( ^. B
Round 2
+ Z6 p: w% v* }9,10 vs 11,12 = equal, `9 N/ [7 j! b
; o" U3 K* d) L+ T7 Q; D- INo Round 3
3 v3 f; H8 y$ v$ l' u" u0 x
8 f# \5 }3 D- s6 ?$ W' e8 }The answer is 13.' \( U) {; n! Y* j, c
% B o5 j7 c% a5 d唔知我答得正唔正確呢?! 
4 I1 V+ Z! |, i" Y: a7 q3 P9 r1 Q S
[ 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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