SETS D1

If n(A)= 40 , n(B)= 90 and n(AnB)=30, find n(AuB).

Solution

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

            = 40 + 90 – 30

            = 130 – 30

            = 100

Hence n(AuB) = 100 answer

TRY THIS………………….

If n(A)= 120 , n(B)= 90 and n(AnB)=50, find n(AuB).