Alguém pode me ajudar a responder essa questão?

12 - (UFRN/2006) Se log5 x + log5 y = 3 , com x e y inteiros maiores que 1, então:

a) x ⋅ y =15

b) x + y = 20

c) x ⋅ y = 25

d) x + y = 30

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