25–K–8,   23–I–11,  21– G–14, 19–E–17, ?

6, 12, 20, 30, ?

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.

TSF, RPJ, PMN, NJR, ?

In the following question, select the number which can be placed at the sign of question mark (?) from the given alternatives.

1, 2, 5, 12, 27, 58,121…….

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

_k_m_kl_jk_m

8, 7, 11, 12, 14, 17, 17, 22, ?