Which expression represents the number of elements in A∖BA \setminus BA∖B?
n(A)−n(B)n(A) - n(B)n(A)−n(B)
n(A)−n(A∩B)n(A) - n(A \cap B)n(A)−n(A∩B)
n(A∪B)−n(B)n(A \cup B) - n(B)n(A∪B)−n(B)
n(A)+n(B)n(A) + n(B)n(A)+n(B)