Jawaban:

1.Himpunan bagian dari A = {a, b, c} sebagai berikut.

a. himpunan bagian yang tidak memiliki anggota : ∅

b. himpunan bagian yang memiliki 1 anggota : {a}, {b}, {c}.

c. himpunan bagian yang memiliki 2 anggota : {a, b}, {a, c}, {b, c}

d. himpunan bagian yang memiliki 3 anggota : {a, b, c}.

Banyaknya anggota himpunan bagian dari A adalah n(A) = 2³ = 8.

2.M = {x| 2 ≤ x ≤ 6}

⇔ M = {2, 3, 4, 5, 6}

Himpunan M = {2, 3, 4, 5, 6}.

Himpunan bagian dari M adalah

(a). 0 anggota ada 1 buah, yaitu : ∅,

(b). 1 anggota ada 5 buah, yaitu : {2}, {3}, {4}, {5}, {6},

(c). 2 anggota ada 10 buah, yaitu : {2, 3}, {2, 4}, {2, 5}, {2, 6}, {3, 4}, {3, 5}, {3, 6}, {4, 5}, {4, 6}, {5, 6}

(d). 3 anggota ada 10 buah, yaitu : {2, 3, 4}, {2, 3, 5}, {2, 3, 6}, {2, 4, 5}, {2, 4, 6}, {2, 5, 6}, {3, 4, 5}, {3, 4, 6}, {3, 5, 6}, {4, 5, 6},

(e). 4 anggota ada 5 buah, yaitu : {2, 3, 4, 5}, {2, 3, 4, 6}, {2, 3, 5, 6}, {2, 4, 5, 6}, {3, 4, 5, 6}, dan

(f). 5 anggota ada 1 buah, yaitu : {2, 3, 4, 5, 6}.

3.P(A) = {∅, {1}, {2}, {3}, {4}, {1, 2}, {1, 3}, {1, 4}, {2, 3}, {2, 4}, {3, 4}, {1, 2, 3}, {1, 2, 4}, {1, 3, 4}, {2, 3, 4}, {1, 2, 3, 4}}

Banyaknya anggota himpunan kuasa dari P(A) adalah 2⁴ = 16.

(b). B = {1, 2, 3, 4, 5}

P(B) = {∅, {1}, {2}, {3}, {4}, {5}, {1, 2}, {1, 3}, {1, 4}, {1, 5}, {2, 3}, {2, 4}, {2, 5}, {3, 4}, {3, 5}, {4, 5}, {1, 2, 3}, {1, 2, 4}, {1, 2, 5}, {1, 3, 4}, {1, 3, 5}, {1, 4, 5}, {2, 3, 4}, {2, 3, 5}, {2, 4, 5}, {3, 4, 5}, {1, 2, 3, 4}, {1, 2, 3, 5}, {1, 2, 4, 5}, {1, 3, 4, 5}, {2, 3, 4, 5}, {1, 2, 3, 4, 5}}

Banyaknya anggota himpunan kuasa dari P(B) adalah 2⁵ = 32.

(c). C = {1, 2, 3, 4, 5, 6, 7, 8}

P(C) = {∅, {1}, {2}, {3}, {4}, {5}, {6}, {7}, {8}, {1, 2}, {1, 3}, {1, 4}, {1, 5}, {1, 6}, {1, 7}, {1, 8},{2, 3}, {2, 4}, {2, 5}, {2, 6}, {2, 7}, {2, 8}, {3, 4}, {3, 5}, {3, 6}, {3, 7}, {3, 8}, {4, 5}, {4, 6}, [4, 7}, {4, 8}, {5, 6}, {5, 7}, {5, 8}, {6, 7}, {6, 8}, {7, 8}, {1, 2, 3}, {1, 2, 4}, {1, 2, 5}, {1, 2, 6}, {1, 2, 7}, {1, 2, 8}, {1, 3, 4}, {1, 3, 5}, {1, 3, 6}, {1, 3, 7}, {1, 3, 8}, {1, 4, 5}, {1, 4, 6}, {1, 4, 7}, {1, 4, 8}, {1, 5, 6}, {1, 5, 7}, {1, 5, 8}, {1, 6, 7}, {1, 6, 8}, {1, 7, 8}, {2, 3, 4}, {2, 3, 5}, {2, 3, 6}, {2, 3, 7}, {2, 3, 8}, {2, 4, 5}, {2, 4, 6}, {2, 4, 7}, {2, 4, 8}, {2, 5, 6}, {2, 5, 7}, {2, 5, 8}, {2, 6, 7}, {2, 7, 8}, {3, 4, 5}, {3, 4, 6}, {3, 4, 7}, {3, 4, 8}, {3, 5, 6}, {3, 5, 7}, {3, 5, 8}, {3, 6, 7}, {3, 6, 8}, {3, 7, 8}, ..., {1, 2, 3, 4, 5, 6, 7, 8}}

Banyaknya anggota himpunan kuasa dari P(C) adalah 2⁸ = 256.

4.K = {p, q, r, s, t}

Himpunan bagian yang memiliki

a) 2 anggota ada 10 buah, yaitu : {p, q}, {p, r}, {p, s}, {p, t}, {q, r}, {q, s}, {q, t}, {r, s}, {r, t}, {s,t}. 

b) 3 anggota ada 10 buah, yaitu : {p, q, r}, {p, q, s}, {p, q, t}, {p, r, s}, {p, r, t}, {p, s, t}, {q, r, s}, {q, r, t}, {q, s, t}, {r, s, t}.

c) 4 anggota ada 5 buah, yaitu : {p, q, r, s}, {p, q, r, t}, {p, q, s, t}, {p, r, s, t}, {q, r, s, t}.

5.Y = {7, 11, 13, 17, 19, 23}. 

(a). Himpunan bagian yang memiliki 2 anggota ada 15 buah, yaitu : {7, 11}, {7, 13}, {7, 17}, {7, 19}, {7, 23}, {11, 13}, {11, 17}, {11, 19}, {11, 23}, {13, 17}, {13, 19}, {13, 23}, {17, 19}, {17, 23}, {19, 23}.

(b). Himpunan bagian yang memiliki 3 anggota ada 20 buah, yaitu : {7, 11, 13}, {7, 11, 17}, {7, 11, 19}, {7, 11, 23}, {7, 13, 17}, {7, 13, 19}, {7, 13, 23}, {7, 17, 19}, {7, 17, 23}, {7, 19, 23}, {11, 13, 17}, {11, 13, 19}, {11, 13, 23}, {11, 17, 19}, {11, 17, 23}, {11, 19, 23}, {13, 17, 19}, {13, 17, 23}, {13, 19, 23}, {17, 19, 23}.

(c). Himpunan bagian yang memiliki 4 anggota ada 15 buah, yaitu :

{7, 11, 13, 17}, {7, 11, 13, 19,}, {7, 11, 13, 23}, {7, 11, 17, 19}, {7, 11, 17, 23}, {7, 11, 19, 23}, {7, 17, 19, 23}, {7, 13, 17, 19}, {7, 13, 17, 23}, {7, 17, 19, 23}, {11, 13, 17, 19}, {11, 13, 17, 23}, {11, 13, 19, 23}, {11, 17, 19, 23}, {13, 17, 19, 23}.

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