Number Series Questions

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.
XIIIII, IXIIII, IIXIII, IIIXII,IIIIXI, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

200, 100, 50, 25, 12.5, 6.25, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

5, 11, 24, 51, ?

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.

3/5, 1.4, 11/5, ? , 19/5, 4.6

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

-1, 1, 4, 9, 16, ?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

13,25,49,85, ?

A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
-4, ? , 1, 3.5, 6, 8.5

A series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series. 100, 50, 52, 26, 28, ? , 16, 8