5, 54, 90, 115, 131, 140?

4, 4, 8, 24, 96, 480, (?)

Select the combination of letters that when sequentially placed in the blanks of the given series  will complete the series.
rtx_sx_z_txy_ _ yz

What is the missing term in the given series? The series is 11, 44, 48, ?, 196

The missing term in the series 6, 14, 30, __, 126, 254 is

Find the value of Question mark (?).
25 : 37 :: 49 :?

What is the next term in the given series?
22A, 42E, 62I, ?

What is the next term in this series?
L, D, O, E, R, F, ?