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Source:
January 1, 2022
number theory
Problem Statement
Compute the last two digits of
9
2020
+
9
202
0
2
+
.
.
.
+
9
202
0
2020
9^{2020} + 9^{2020^2}+ ... + 9^{2020^{2020}}
9
2020
+
9
202
0
2
+
...
+
9
202
0
2020
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