Question

if n(a)=40,n(b)=60and (aub)=80
Find the value of n(AnB)

Answer 1

Answer:

formula

n(aub)=n(a)+n(b)-n(anb)

80=40+60-n(anb)

80=100-n(anb)

80-100=-n(anb)

-20=-n(anb)

n(anb)=20 ........ans......