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

BDF, DHL, FLR,?

In the following question, select the missing number from the given alternatives.

In the following question, find the missing number from the given options.

Study the given pattern carefully and select the number that can replace the question mark (?) in it.

9                     14                 7

           130                135             168

13                   9                   ? 

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