1,6,15,28,()。
A.36
B.39
C.42
D.45
2,6,13,39,15,45,23,()。A.46B.66 C.68D.69
2,-2,6,-10,22,()A.-36B.-40 C.-42D.-48
1,6,15,28,()。A.36 B.39 C.42 D.45
6,13,39,15,45,23,()A.69 B.66 C.68 D.46
1,6,15,28,45,()A.70B.66C.60D.88
1,7,15,27,45,()A.36B.52C.71D.74