Question

4. Si n(A ∪ B) = 120; n(A ∩ B) = 80; n (A – B) = 10, determina: n(A) + n(B)

Answer 1

Sabemos que:

n(A) =n (A – B) + n(A ∩ B)

n(A) = 10 + 80

n(A) = 90

Luego:

n(B) =n(A ∪ B) - n(A) + n(A ∩ B)

n(B) = 120 - 90 + 80

n(B) = 110

Luego:

  n(A) + n(B)

= 90 + 110

= 200  → RESPUESTA