Diket = P = { bilangan asli kurang dari 20 } Q = { Bilangan kelipatan 3 kurang dari 20 } Tentukan : a.P – Q = b.n(P-Q) =​

a. P – Q = {1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16,

17, 19}

b. n(P – Q) = 13

Penjelasan dengan langkah-langkah:

P= {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,

15, 16, 17, 18, 19}

Q = {3, 6, 9, 12, 15, 18}

a. P – Q = {1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16,

17, 19}

b. n(P – Q) = 13