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

22, 21, 23, 22, 24, 23, ?

Complete the following number series.
24, 60, 120, 210___

Which number will come in place of question mark in the following number series?
4,7, 12, 21 , 38,?

Directions: In the following questions, a series is given with one term missing. Choose the correct alternative from the given ones that will complete the series:

J2Z , K4X , I7V , ? , H16R , M22P 

Select the correct option that will fill in the blank and complete the series.
KNQ, OPR, SRS,_____

Select the correct option that will fill in the blank and complete the series.
3, 9, 36, 180, ?

Select the term that will come next in the following series?
CAY, FDB, IGE, ?

Select the option that correctly fills in the blanks and complete the series.
441, 484, 529, 576, __