Resposta:
4
Explicação passo-a-passo:
Note que:
8 ≡ 1 mod(7)
2^3 ≡ 1 mod(7)
(2^3)^1504 ≡ 1^1504 mod(7)
2^(3 . 1504) ≡ 1 mod(7)
2^4512 ≡ 1 mod(7)
2^4512 . 2^2 ≡ 1 . 2^2 mod(7)
2^(4512 + 2) ≡ 2^2 mod(7)
2^4514 ≡ 4 mod(7)
