MathDB
Problems
Contests
National and Regional Contests
Greece Contests
Greece Junior Math Olympiad
2009 Greece Junior Math Olympiad
3
3
Part of
2009 Greece Junior Math Olympiad
Problems
(1)
Algebra expressions
Source: Archimedes Junior 2009
3/17/2020
Consider the numbers
A
=
1
4
⋅
3
6
⋅
5
8
⋅
.
.
.
595
598
⋅
597
600
A= \frac{1}{4}\cdot \frac{3}{6}\cdot \frac{5}{8}\cdot ...\frac{595}{598}\cdot \frac{597}{600}
A
=
4
1
⋅
6
3
⋅
8
5
⋅
...
598
595
⋅
600
597
and
B
=
2
5
⋅
4
7
⋅
6
9
⋅
.
.
.
596
599
⋅
598
601
B= \frac{2}{5}\cdot \frac{4}{7}\cdot \frac{6}{9}\cdot ...\frac{596}{599}\cdot \frac{598}{601}
B
=
5
2
⋅
7
4
⋅
9
6
⋅
...
599
596
⋅
601
598
. Prove that: (a)
A
<
B
A < B
A
<
B
, (b)
A
<
1
5990
A < \frac{1}{5990}
A
<
5990
1
algebra