Question

Considerando

A ∩ B = {6,8,10}
A-B= {4,12}
A U B = {2,3,4,6,8,10,12}

Pode-se afirmar que

(A) B={2,3,6,8,10,12}
(B) B={2,3,6,8,10}
(C) B={6,8,10}
(D) B={2,3,12}
(E) B={4,6,8,10,12}

Answer 1

Considerando

A ∩ B = {6,8,10}  (INTERSECÇÃO)
A-B= {4,12} ===> (somente no A)
A U B = {2,3,4,6,8,10,12} = (juntos AeB)

somente B???
AUB = { 2,3,4,6,8,10,12}
tira o A-B = { 4,12}

sobra ==>B = {2,3,6,8,10}

Pode-se afirmar que

(A) B={2,3,6,8,10,12}
(B) B={2,3,6,8,10}======> letra (B)
(C) B={6,8,10}
(D) B={2,3,12}
(E) B={4,6,8,10,12}