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Problems
Contests
National and Regional Contests
PEN Problems
PEN D Problems
20
20
Part of
PEN D Problems
Problems
(1)
D 20
Source:
5/25/2007
Show that
1994
1994
1994
divides
1
0
900
ā
2
1000
10^{900}-2^{1000}
1
0
900
ā
2
1000
.
Congruences