2,3,6,15,()
A.20
B.24
C.32
D.42
3,6,8,13,20,(),51A.31B.28C.42D.32
3,6,8,13,20,(),51 A.31B.28C.42D.32
2,3,6,15,() A.20 B.24 C.32 D.42
2, 3, 6, 15, ()。A.32 B.42 C.52 D.62
3, 6, 8, 13, 20, (), 51 A.31 B.28 C.42 D.32
1,2,4,3,8,6,16,10,() A.15 B.16 C.24 D.32