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determinati ultima cifra a numerelor 2 2017

Răspuns :

u(2²⁰¹⁷) = ...

u(2¹)=2 ; u(2²)=4 ; u(2³)=8 ; u(2⁴)=u(16)=6; de aici incepe repetitia !

inseamna ca 2017:4=504 (rest 1)

=> u(2²⁰¹⁷) = u(2⁴*⁵⁰⁴) * u(2¹) = u(6)*u(2) = u(12)=2 ;