A series is given, with one number missing. Choose the correct alternative from the given ones that will complete the series.
M5D, O7G, Q10J, ?, U19P

Complete the following number series.
6, 10, 18, 34 ?

Which is the next term in the following sequence of letter clusters?
PLaN, OJbP, NHcR, MFdT, LDeV,

What will come at the place ___ ?In the given series? 
 BZA, DYC, FXE, ?, JVI

Find the missing term of sequence.
AB, BA, ABC, CBA, ABCD, ____

Choose the correct alternative from the given ones that will complete the given sequence.
1.5, 2.3, 3.1, 3.9, ?

Direction (66-70): What should come in place of the question mark(?) in the following number series?

5 , 10 , 17 , ? , 37 , 50 

Complete the following series.
12, 8, 14, 6, 16, ?