1890
2310
2520
2730
1.1,2,6,30,210,( )
2.1,2,6,30,210,()A、1890B、2310C、2520D、2730
3.单选题1,2,6,30,210,( )。A 1890B 2310C 2520D 2730
4.1,2,6,30,210,() A.1890 B.2310 C.2520 D.2730