A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
 DAF, FED, HIB, ? 

Which number will replace the question mark (?) in the following series?
16, 24, 36, ?, 81

The series given below contains a sequence of numbers. Identify the incorrect combination: 

56, 54, 58, 49, 66, 34

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

Select the number from among the given options that can replace the question mark (?) in the following series

237, 196, 155, 114, ?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
122, 197, 290, ?

What will come next in the given series?
6L, 9M, 14O, 21R, ?

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