Question

If n(A)=80,and n(B)=65,what is the least value of n(AuB)=? please help me friends

Answer 1

Explanation:

n(AUB)=n(A)+n(B)-n(A∩B)

greatest intersection of (A∩B)=65

n(A∪B)=80+65-65=80

so least value of n(A∪B)=80