Question

if AcB,n(A)=20 and n(B)=45,find the value of n(AUB) and n(ANB).

Answer 1

n(AUB)=n(A)-n(B)=20-45=-20
n(ANB)=n(A)+n(B)-n(AUB)
=20+45-(-20)
=20+45+20
=95