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= 2⁵
= 32
====
pembuktian :
himpunan kosong = { } = 1
himpunan 1 anggota = {a}{b}{c}{d}{e} = 5
himpunan 2 anggota = {ab}{ac}{ad}{ae}{bc}{bd}{be}{cd}{ce}{de} = 10
himpunan 3 anggota = {abc}{abd}{abe}{acd}{ace}{ade}{bcd}{bce}{bde}{cde} = 10
himpunan 4 anggota = {abcd}{abce}{abde}{acde}{bced} = 5
himpunan 5 anggota = {abcde} = 1
1 + 5 + 10 + 10 + 5 + 1 = 32