question_answer

Find the missing term in the following series from the given alternatives. 1, 3, 7, 13, 21,?

A) 27                      

B)         29

C) 31   

D)        33

E) None of these

Correct Answer: C

Solution :

Explanation Option [c] is correct. In this series, the difference between two successive terms is increase by +2 beginning from +2 as shown in the diagram given below: Thus, the required term is 31.