SETS B2

If n(A)= 110 , n(B)= 140 and n(AnB)=150, find n(AuB).

Solution

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

             = 110 + 140 – 150

             = 250 – 150

             = 100

Hence n(AuB) = 100 answer