It's a very difficult calculation problem, simple calculation (123456 + 234561 + 345612 + 456123 + 561234 + 612345) what is 7,

123456=100000+20000+3000+400+50+6
234561=200000+30000+4000+500+60+1
Others, and so on
So = [(100000 + 200000 +...) +600000)+(10000+…… +60000)+(1000+…… +6000)+(100+…… +600)+(10+…… +60)+(1+…… +6)]/7
=(21×100000+21×10000+21×1000+21×100+21×10+21×1)/7
=3×111111
=333333

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