Question

if n(A-B)=7,n (B-A)=21and n(A U B)=40 then find n(A internation B)​

Answer 1

Answer:

1320

Step-by-step explanation:

n(A-B)=n(AuB)-n(B)

7 = 40 - n(B)

n(B) = 33

n(A-B)= n(A)- n(B)

7= n(A) - 33

n(A) = 40

n(AnB) = 40×33 = 1320