If n(A∪B)=50n(A \cup B) = 50n(A∪B)=50, n(A)=30n(A) = 30n(A)=30, and n(B)=30n(B) = 30n(B)=30, what is n(A∩B)n(A \cap B)n(A∩B)?
5
10
15
20