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

Narendra Modi, Manmohan Singh, Atal Bihari Vajpayee, ?

Which of the following n umbers will replace the question mark (?) in the given series?
 78, 112, 64, ?, 50, 140 

Which letter-cluster will replace the question mark (?) to complete the given series?
DRBZ, ABKX, ?, UVCT, RFLR

Which of the following numbers will replace the question mark (?) in the given series?

26, 54, 110, 222, ?,  894

Select the letter-pair that can replace the question mark (?) in the following series.

AR, CU, EX, GA, ?

In each of the following letters series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.
aa _ _ aba _ bca _ aab _ a _

Which of the following numbers will replace the question mark (?) in the given number series?
 56, 68, ?, 128, 176, 236

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