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

B, D, G, L, S, ?

In the given figure select the number that can replace the question mark (?).

Find the missing number?

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
I, L, O, R, ?

Find the missing number?
2, 15, 41, 80, ?

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 from the given alternatives.