In the following question, select the missing number from the given series.
1, 7, 3, 9, 6, 12, 10, 16, 15, ?

Direction: In the following question, select the missing number from the given series.
7, 10, 14, 19, 25, ?

Find the next number of this series
10, 16, 25, 37, ?

Select the combination of letters that when sequentially placed in the gaps of the given letters series will complete the series.
b_bab_bc_abbb_ba_b

Find the missing number.
25, 121, 361, 1369, ?

What will come in place of question (?) mark in the following series?
CD     FG     JK     ?        UV

Which of the following groups of alphabets should replace the blank spaces so that the group of alphabets, given in bold, follow a logical pattern from the preceding and the following group of alphabets?
b w_ y z a   d s t u v _   _o p q r e

20, 21, 19, 16, 17, 13, 14, 11, ?