tolong dijawab soal himpunan

M = {1,2,3,4,5,6,7,8,9}
N = {11,12,13,14,15,16,...}
P = {1,2,3,4}

a) n(M) = 9
b) n(N) = tak terhingga
c) n(P) = 4

M ada 9 angka
N tak terhingga
P ada 4 angka