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{ } {1} {2} {3} {4} {1,2} {1,3} {1,4} {2,3} {2,4} {3,4} {1, 2, 3} {1, 2, 4} {1, 3, 4} {2, 3, 4} {1,2,3,4}
0 anggota = 1
1 anggota = 4
2 anggota = 6
3 anggota = 4
4 anggota = 1
Jadi, n(A) = 1 + 4 + 6 + 4 + 1 =
atau
n(A) = 2^4 = 2 x 2 x 2 x 2 =