What will come in place of question mark(?) in the following number series?

a__bc__c___abb___bca___

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

125, 80 , 45, 20, ?

What will come in place of question mark(?) in the following number series?

A5, C10, E15, G20, ?

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

96, 109, 134, 175, ?

What will come in place of question mark(?) in the following number series?

BDE, CFG, EJK,  ?

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

5 , 10 , 17 , ? , 37 , 50 

What will come in place of question mark(?) in the following number series?

BJ , CL , EN , HP , ? 

Find the next term in the given series.
B2, K12, T72, ______