Question

if n(a)=20 n(b)=25 n(a∩b)=12 then find n(aub)

Answer 1

n(a) = 20 , n(b) = 25 , n(a∩b)=12

n(aub) = n(a) + n(b) - n(a∩b)

= 20 + 25 -12

= 33

hope it helps