Identify the correct option to complete the following series.
1, 3, 5, 11, 21, 43, 85, 171,___

Select the correct option that will fill in the blank and complete the series.

1024, ?, 1600, 2000, 2500, 3125

Find the next number in the following number series?
31, 29, 24, 22, 17, ?

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 

In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it?
gh_i_hi_ig_ii_ _

Find the next number in the series.
4, 9, 20, 43, ?

Select the figure that will come next in the following figure series.

18, 25, 23, 30, ?