Răspuns :
U(106)=ultima cifra a lui 106
U(6^1)=6
U(6²)=U(36=6
U(6³)=U(216)=6
...................................
U (6^n)=6 ∀ n∈ N*
De asemenea orice numar care are ultima cifra 6 ridicat la orice putere are ultima cifra 6
Prin urmare
U(106)^1006=6
U(6^1)=6
U(6²)=U(36=6
U(6³)=U(216)=6
...................................
U (6^n)=6 ∀ n∈ N*
De asemenea orice numar care are ultima cifra 6 ridicat la orice putere are ultima cifra 6
Prin urmare
U(106)^1006=6