Question

N(a)=12,n(b)=10 n(aub=18 find n(a)intersection b

Answer 1

n(A)=12

n(B)=10

n(AUB)=18

Now, n(AUB) = n(A)+n(B)-n(A intersection B)

=>18=12+10-n(A intersection B)

=>18=22-n(A intersection B)

=>-4= -n(A intersection B)

=>n(A intersection B) =4

The required answer is 4