Which group of letters will complete the given letter series by sequentially placing the blank space?
M_OMMN_M_NOMMN_M

Select the number that can replace the question mark (?) in the following series.
2807, 1400, 697, ?, 171, 84

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

1024, ?, 1600, 2000, 2500, 3125

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 

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

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_ _

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

237, 196, 155, 114, ?

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