Question

If n(a) + n(b) - n(a union b ) = ____​

Answer 1

Answer:

n(A)+n(B)-n(A∪B)  =  n(A∩B)

Step-by-step explanation:

we know,

n(A∪B) = n(A)+n(B)-n(A∩B)

so, n(A∪B) + n(A∩B)= n(A)+n(B)

=> n(A∩B)= n(A)+n(B)-n(A∪B)