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Ultima cifra la 7 la puterea 2005


Răspuns :

u(7^2005)=
u(7^1)=7
u(7^2)=9
u(7^3)=3
u(7^4)=1
u(7^5)=7
u(7^6)=9
u(7^7)=3
u(7^8)=1
............
2005:4=501rest1
=>u(7^2005)=7