18, 25, 23, 30, ?

Choose the correct alternatives from given ones that will complete the series.

8, 24, 12, 36, 18, ?

Find the wrong number in the series from among the alternatives?
3, 8, 15, 24, 34, 48, 63

Select the combination of letters that when sequentially placed in the gaps of the given letters series will complete the series.
H _ _ EPCK _ _ CDEP _ KFHC _ EPC _ F

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

13 18 22 25 27 ?

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

237, 196, 155, 114, ?

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

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

?, Vice President, Prime Minister, Deputy Prime Minister