Tolong dijawab dong!!!

2.a.1/5,1/25,1/125,1/625
B.1,3,5,7,9,11,13
C.5,10,20,40,60,80
D.40,32,24,16,8
3.a.1,1,3,5,7,9
B.3,6,10,15,18,21,24
C.80,40,20,10,5,5
D.121,144,169,196,225,256
4.a.1,3,5
B.128,64,32
C.21,19,17
D.1,1,3