-2,3,-6,15,-42,()
A. -51
B. -84
C. 79
D. 123
请帮忙给出正确答案和分析,谢谢!
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.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