Find the cube of

What will come in place of the question mark (?) in the following series?

24, 8, 15, ?, 12, 4

56, 27, 14.5, 6.25, ?, 1.0625

945, 1890, ?, 504, 144, 32

12       17       44       147       ?      3065      18420

257, 399, 566, ?, 983, 1237 

What will come in place of (?) Question mark in the given number series.

500, 489, 467, 434, 390, 335, ?

11       16       42       141       ?      2945      17700

37, 49, 63, ?,  97, 117

Choose the missing term.

R, U, X, A, D,?

380, ?,  360, 324, 260, 160