tolong donk nomor 8 dan 9..gak ngerti bituh jawaban semuanya

8)
a.{4}
P(a)={∅{4}}

b.{4,9}
P(b)={ ∅{4},{9}{4,9} }

c.{∅,a}
P(c)={∅,{∅},{a}{∅,a}}

d.{∅,y,{y}}
P(d)={∅,{∅},y.{y}{∅,y},{∅,{y}},{y,{y}}}

9)
a.
P({8})={∅,{8}}

b.
P({1,7})={∅,{1},{7},{1,7}}

c.
P(∅)={∅}

d.
P({x,{x},{x,y}})={∅,{x},{{x}},{x,y},{x,{x}},{x.{x,y}},{{x},{x,y}}}