13.Venn Diagram

Question 1

n(A ⋃ B)

Answer 1

n(a) + n (B) – n(A ⋂ B)

Question 2

n(A ⋃ B ⋃ C)

Answer 2

n(a) + n(B) + n(c) – n(A ⋂ B) – n(B ⋂ C) – n(A ⋂ C) + n(A ⋂ B
⋂ C)