1. P = {1, 3, 5, 7, 11, 13}

Q = {7, 11, 13, 17, 19, 23}

P ∩ Q = {7, 11, 13}

n(P ∩ Q) = 3

Jawaban: C.

2. P = {1, 3, 5, 7, 9}

Q = {2, 3, 5, 7, 11}

P ∪ Q = {1, 2, 3, 5, 7, 9, 11}

Jawaban: D.

3. A = {1, 2, 3, 4, 5}

B = {0, 1, 2, 3, 4, 5}

B - A = {0}

Jawaban: gak ada pilihannya

4. B’ = {e}

A ∩ B’ = {b, d} ∩ {e} = { }

Jawaban: B.

5. n(S) = 47

n(A) (berolahraga) = 38

n(B) (membaca) = 36

Ditanya: n(A ∩ B) = ...?

Mencari n(A ∪ B) = S - 5 = 47 - 5 = 42

n(A ∩ B) = (n(A) + n(B)) - n(A ∪ B)

= (38 + 36) - 42

= 74 - 42

= 32

Jawaban: B.