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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; d/ J3 }: s) ^' K; ~
& k2 A' q' [8 L, h. R& vGroup A: 1,2,3,4" M" w# N9 N9 {3 Q, y4 j& p. B
Group B: 5,6,7,8 I( { s' [# H* z* h- C! Y, a
Group C: 9,10,11,127 Y" u! a8 j/ Y2 ?% O5 X9 o, m, I
Group D: 133 ^5 v& c' q- T
. y7 \; P7 l5 ?# m- f+ U! U' M% _1 iRound 1! h8 C) a1 V- a. [
Group A vs Group B
' X, a9 W* d h# j' }如A and B一樣, 即較輕一粒在Group C or D
3 G. d& d. { B; I# H& c9 R) Q/ j1 N
Round 2: U- S8 U1 I1 z# A# b; {
再在Group C拆成:
' c. r- ^" h; Z/ a" FGroup Ca: 9,109 K$ |0 o% z8 r$ E5 X, z/ |
Group Cb: 11,125 J; v( ]) L1 M0 T: d
然後再秤, 如一樣, 即13為較輕一粒.
/ S" R4 r! v2 U8 @' O( c
2 s7 X& S; P0 G) g4 p如不同, 即較輕一組有一粒較輕波子在其中,
' R: g+ |! O" F+ h- H要再秤, Round 3, 之後便知答案.
. o( v( b y1 i: l7 ~
2 u9 x% E/ o4 E7 C2 T8 i* I A' V, ge.g. #1 假設10為較輕的一粒1 s- d2 U1 d9 P0 C
Round 1
V' w1 \. b/ _- r: V; j- G1,2,3,4 vs 5,6,7,8 = equal
/ I* m, B4 T/ x9 `- x% q2 n
% `2 b( o1 O7 g* j% PRound 2) W% M j* h, r; Y7 h3 A
9,10 vs 11,12 = 9,10 < 11,12
# }7 W# Z" ~7 {+ ~
2 c1 }- x, ^8 [7 k- D( L: n6 LRound 3
y, m9 Q/ g; p/ X$ N8 b; ?1 }9 vs 10 = 9 > 10
3 F4 C$ d4 j6 |4 v1 i, G
9 n, y" A8 B9 U7 Z: i# N: eThe answer is 10.
4 ^" [+ j) [# c
% j% \6 M3 Z6 ve.g. #2 假設7為較輕的一粒
1 v" Y# Q; E$ B/ `Round 1, a+ l. R& c, D$ a
1,2,3,4 vs 5,6,7,8 = 1,2,3,4 > 5,6,7,8
& R5 q6 O) H! Z' d a7 D8 Z, `$ B& H6 P
Round 2+ R: j+ m+ |2 Y$ E
5,6 vs 7,8 = 5,6 > 7,8" {1 A: Z) ?7 f6 U
& H Y5 L+ N @% [; i, q4 x
Round 3
$ _7 u8 o+ N V4 N% T; C7 vs 8 = 7 < 8& g7 y2 s" G- O0 O, o" R
9 H; }! S( M/ Y. YThe answer is 7.
$ y; u+ H6 Q% a: ^0 ]( j8 M+ S
e.g. #3 假設13為較輕的一粒
: m" \: Z$ a1 J0 H* G$ \6 hRound 1
# i! Y+ n4 l: X- C, }! Z" f1,2,3,4 vs 5,6,7,8 = equal
# K4 M# u' Y6 T" t, n% T3 y, u( Q- U# N- I, w4 a
Round 2
! P8 }7 E/ a3 Z. j, t# X @9,10 vs 11,12 = equal% U0 c+ Y1 a, v. F% [ K' f, T
7 b2 F9 V, r3 s; V0 KNo Round 3% g) j( M; s% C# o
+ t; ?: h/ f! S7 G) z, a
The answer is 13.
# I/ f0 ]3 \% t) s, o! D& L) K O8 [; F+ T% H7 P! @
唔知我答得正唔正確呢?!  7 p. {/ E' Z8 h
2 F; P! `6 A- p# F
[ 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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