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n(AuB) = n(a) + n(b)
n(aub) = 20 + 13
n(aub) = 33
b.
n(aub)= n(a)+n(b)-n(anb)
n(aub)= 23+18-6
n(aub)=35
c.
n(anb)= n(a)+n(b)-n(aub)
n(anb)= 19+31-42
n(anb)=8
d.
n(b)=n(aub)-n(a)+n(anb)
n(b)= 20-15+8
n(b)=13
e.
n(aub)= 17 (karena anggota B adalah anggota A)