Tolong dong plis pakai cara ya..

Mapel : Matematika
Bab : Himpunan

H = {p,q,r,s,t}
n(H) = 5

a)
Himpunan bagian A = (2)^5 = 32

b)
3 elemen
=====> {p,q,r},{p,r,s},{p,s,t},{p,r,s},{p,s,t},{{p,q,t},{p,q,t},{p,r,t},{p,s,t},{r,s,t}

10 Anggota

c)
Cara Cepat :
4 Elemen

[tex] \frac{5 \times 4 \times 3 \times 2}{1 \times 2 \times 3 \times 4} [/tex]

[tex] = \frac{120}{24} [/tex]

[tex] = \: 5 \: anggota[/tex]