tolong dijawab please...

1 a) n(A)= { 1,2,3,4,5,6,7,8,9 }
1 b) n(B)= { 1,3,5,7,9,11,13,15 }
1 c) n(C)= { 2 }
1 d) n(D)= { 1,2,3,4,5,6,7,8,9 }
1 e) n(E)= { -2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12 }
1 f) n(F)= { 0,1,2,3,4,5,6,7,8,9 }

2) n(A)= { 3,9,15,21,27 }