Directions: In the following question four words have been given, out of which three are alike in some manner and the for one is different. Choose out the odd one.

Choose the odd pair group in following options?

Select the related word/ letters/ number from the given alternatives.
Smart : Clever :: Irrelevant : ?

How many such pairs of letters are there in the word ‘OBLIGATION’ each of which has as many letters between them in the word as they have between them in the English alphabet? 

Direction (66-70): What should come in place of the question mark(?) in the following number series?

5 , 10 , 17 , ? , 37 , 50 

In the following question, find the missing letters in the given letters.
$$ {D\over 5},{G\over 9},{J\over 14},{M\over20},?$$

The salaries of Employees B, R, G A and M are given in relation to each other:
M gets more salary than A and G
R's salary is less than three persons.
B's salary is the lowest.
Who has the second minimum salary?

Raju is 10th from the top and Ravi is 21st from the bottom. There are 3 students between them. How many total students are there in the class?