1.1, 2, 6, 15, ( )
A.19 B.24
C.31 D.27
3.2.7, 102, 4.2, 103, 5.7, 105, 7.2, 107, ( ), ( )
A.8.7,109 B.8.3,109
C.8.7,1011 D.8.3,1011
5.6,7,8,13,15,21,( ),36
A.27 B.28
C.31 D.35
6.74,38,18,10,4,( )
A.2 B.1
C.4 D.3
7. 21648, 2165, 217, 22, ( )
A.4 B.3
C.2 D.1
8. 1, 2, 2, 4, 16, ( )
A.64 B.128
C.160 D.256
9. 1 269, 999, 900, 330, ( )
A.190 B.299
C.270 D.1900
10. 5, 7, 11, 13, ( )
A.15 B.17
C.19 D.21