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National and Regional Contests
Moldova Contests
Moldova Team Selection Test
1999 Moldova Team Selection Test
7
7
Part of
1999 Moldova Team Selection Test
Problems
(1)
Show that $S$ and $S^{'}$ are disjunctive.
Source: Moldova TST 1999
8/7/2023
Let
A
B
C
ABC
A
BC
be an equilateral triangle and
n
,
n
>
1
n{}, n>1
n
,
n
>
1
an integer. Let
S
S{}
S
be the set of the
n
−
1
n-1
n
−
1
lines parallel with
B
C
BC
BC
that cut
A
B
C
ABC
A
BC
in
n
n{}
n
figures with equal areas and
S
′
S^{'}
S
′
be the set of the
n
−
1
n-1
n
−
1
lines parallel with
B
C
BC
BC
that cut
A
B
C
ABC
A
BC
in
n
n{}
n
figures with equal perimeters. Show that
S
S{}
S
and
S
′
S^{'}
S
′
are disjunctive.
geometry
perimeter