pliss jawab smuanya y bsk dikumpulin..

{a, b, c, d} = 4 = { } , {a} ,{b}, {c}, {d}, {a, b}, {a, c}, {a, d}, {b, c}, {b, d}, {c, d}, {a, b, c}, {a, b, d}, {b, c, d}, {c, d, a}, {a, b, c, d} = 16 = 2⁴

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