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