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

Complete the following series.
BY, GT, LO, ?, VE

Select the term that will come next in the following series.
OBE, PDH, QFK, RHN, ?

Select the terms that will replace the ? in the following series.

Z, X, V, ?, R, P, ?

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

Select the term that will complete the following letter series.
QN, RP, TS, WW, ___ FH

Find the missing number in the given series.
1, 3, 9, 31, ___ 651

Select the combination of letters that when sequentially placed in the gaps of the given letters series will complete the series.
H _ _ EPCK _ _ CDEP _ KFHC _ EPC _ F