Question

,a=4,6,9,15,21andb=6,15,20,23 find aubandanb and verify that n(a)+n(b)=n(aub)+n(anb)

Answer 1

given ,

a=4,6,9,15,21.........n(a)=5

b=6,15,20,23..........n(b)=4

aUb=4,6,9,15,21 U 6,15,20,23

= 4,6,9,15,21,20,23........n(aUb)=9

AnB=4,6,9,15,21 n 6,15,20,23

=6,15........n(AnB)=2

n(a)+n(b)=n(aUb)+n(AnB)

5+4=9+2

9=11

it is not equal