6, 12, 20, 30, ?

Which of the following numbers will replace the question mark (?) in the given series?

7, 19, 4, ?, 1, 25

5, 16, 49, 104, ?

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

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

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

31, 44, 58, 73, 89, ?

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

TSF, RPJ, PMN, NJR, ?