nomor 2

A = {bilangan asli yang kurang dari 10}

  = {1, 2, 3, 4, 5, 6, 7, 8, 9}

B = {semua faktor dari 12}

  = {1, 2, 3, 4, 6, 12}

C = {bilangan genap yang kurang dari 9 dan habis dibagi 3}

   = {6}

a. A ∪ B = {1, 2, 3, 4, 5, 6, 7, 8, 9, 12}

b. B ∪ C = {1, 2, 3, 4, 6, 12}

c. A ∪ B ∪ C = {1, 2, 3, 4, 5, 6, 7, 8, 9, 12}

nomor 3

S = {a, b, c, d, e, f, g, h, i, j, k, l}

A = {a, c, e, g, i}

B = {b, c, e}

a. A - B = {a, g, i}

b. B - A = {b}

c. S - A = {b, d, f, h, j, k, l}

d. S - (A ∪ B) = {d, f, h, j, k, l}

nomor 4

S = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}

P = {2, 3, 5, 7}

Q = 1, 2, 4, 7, 8}

a. = {1, 4, 6, 8, 9, 10}