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4
Junior Regional Olympiad - FBH 2018 Grade 6 Problem 4
Junior Regional Olympiad - FBH 2018 Grade 6 Problem 4
Source:
September 18, 2018
Digits
Last digit
number theory
Problem Statement
Determine the last digit of number
1
8
1
+
1
8
2
+
.
.
.
+
1
8
19
+
1
8
20
18^1+18^2+...+18^{19}+18^{20}
1
8
1
+
1
8
2
+
...
+
1
8
19
+
1
8
20
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