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n =4
yg 2 anggota itu {(2,3), (2,5) (2,7), (3,5), (3,7), (5,7)} = 6
semoga benar dan membantu..
n (P ) = 4
biasanya aku pake bantuan segitiga pascal
1
1 1
1 2 1
1 3 3 1
1 4 6 4 1
↓ ↓ ↓ ↓ ↓
0 agg 1 aggta 2 aggt 3 aggt 4 angg
jadi himpunan dengan 2 anggota ada 6