Resposta :
Resposta:
[tex]\textsf{Leia abaixo}[/tex]
Explicação passo-a-passo:
[tex]\mathsf{A = \{3,6,9,12,15,18\}}\rightarrow\textsf{m{\'u}ltiplos de 3}[/tex]
[tex]\mathsf{B = \{5,10,15,20\}}\rightarrow\textsf{m{\'u}ltiplos de 5}[/tex]
[tex]\mathsf{A \cap B = \{15\}}}[/tex]
[tex]\mathsf{P(A\:U\:B) = P(A) + P(B) - P(A \cap B)}[/tex]
[tex]\mathsf{P(A\:U\:B) = \dfrac{6}{20} + \dfrac{4}{20} - \dfrac{1}{20}}[/tex]
[tex]\boxed{\boxed{\mathsf{P(A\:U\:B) = \dfrac{9}{20} = \boxed{\boxed{45\%}}}}}\leftarrow\textsf{letra A}[/tex]