Question

A and B are two sets if n(A) =20, n(B) =30,n(AuB)=40 than find (AnB)

Answer 1

n(A)=20
n(B)=30
(AUB)=40
then, definitely the (A intersection B)=20
according to.me,

Answer 2

10is the answer
(A)+( B)-(AuB)