If n(A) = 50, n(B)=20 and n(A ∩ B) = 10 then n(A Δ B) is

Question

If n(A) = 50, n(B)=20 and n(A ∩ B) = 10 then n(A Δ B) is (A) 50 (B) 60 (C) 70 (D) 40

Tardigrade Admin · Accepted Answer

n(A Δ B) =n(A ∪ B) -n(A ∩ B) = n(A ) + n(B)-2n(A ∩ B) =50+20-2(10)=50

Q. If n(A) = 50, n(B)=20 and $n (A \cap B) = 10$ then $n (A Δ B)$ is