What comes next in the given series?
6C, 10F, 14I, 18L, ?

In the following question, select the missing number from the given series.
2, 5, 12, 27, ?

5, 54, 90, 115, 131, 140?

Select the number from among the given options that can replace the question mark (?) in the following series

237, 196, 155, 114, ?

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

5, 18, 70, 278, ?

A series is given with one term missing. Choose the correct option from the given ones that will complete the series.

821 460 749 580 701 652 ?

In the following options, select the number which will replace the question mark in the following series.
4, 2, 2, 3 , 6,?

Select the option that will fill in the blank and complete the given series.
6, 10, 19, 35, 60, _