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7.n(A)=125-40=85
n(B)=115-40=75
85+75=160
JADI n(AUB)=160
8.(AUB) diiriskan C ={1,2,3,4,5,6,7}diiriskan{1,2,3,4,5}={1,2,3,4,5}
9.A={a,b,c}=
a.{ },himpunan kosong
b.{a},[b},{c}
c.{a,b},{a,c},{b,c}
d.{a,b,c}