Find the missing number from the below options.
6    24    96
7    28   112
13   52   ?

Find the missing number?

Find the missing number?

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

Find the missing number?

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

Complete the series choosing the missing letters: 

pqrp__qq__rppp__qqr__r__qrppq__rr

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

16, 20, 29, 45, 70, ?