3,7, 47,2207,( )
A.4414;B.6621;C.8828;D.4870847
3,2,3,7,18,() A.47;B.24;C.36;D.70;
:5,7,3,3,25,()。 A.25 B.2 C.47 D.17
5,7,3,3,25,()。 A.25B.2C.47 D.17
3,2,3,7,18,() A.47B.24C.36D.70
3,7,47,2207,()A.4414B.6621C.8828 D.4870847