How many countries are members of the

In the following question, a series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

Find the missing term:

M/14 : O/12 : : U/6 : ?

Find the missing term in the following question:

Find the missing term in the following series:

43 44 ? 69 185

Select the number that can replace the question mark (?) in the following series. 

Find the missing number by analysing the pattern followed by the numbers in each row.

2, 5, 11, 23, ?

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

3.5 , ?,  8.3, 10.7, 13.1 , 15.5