1, 4, 9, 16, 25?

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

BOND, FKRZ, JGVV, NCZR, ?

3, 7, 6, 5, 9, 3, 12, 1, 15, ?

1, 2, 5, 12, 27, 58,121…….

2, 3, 5, 6 ,? , 9, ?, 12

3, 6, 18, 72, ?

Complete the series choosing the missing letter

ab__b__aa__b__ba

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