contest R2 Q3
https://minihotelier.com/blog/2016/05/07/contest-r2-q3/Aptitude
The remainder when 10^10 +10^100 +10^1000 + . . . . . . . +10^10000000000 is divided by 7 is :
a) 0
b) 1
c) 2
d) 5
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