In following questions, three sequence of alphabets/numerals are provided which correspond to each other in some way. Find out alphabets/numerals that come in the blank places.Choose the correct option - C B _ _ D _ B A B C C B _  _ 1 2 4 3  _ _ ? ? ? ? a _ a b _ c _ b _ _ _ _

C. 3, 1, 1, 3

In following number series, two terms have been put within brackets. Choose the appropriate option - 2 , 4 , 12 , 48 , 240 , x

C. 1440

In following question, a number series is given with one term missing. Choose the correct alternative that will same pattern and fill in the blank spaces. - 4 / 9, 9 / 20, , 39 / 86

B. 19 / 42

In following number series, two terms have been put within brackets. Choose the appropriate option - 4, 8, 28, 80, 244, x

B. 728

In following number series, two terms have been put within brackets. Choose the appropriate option - 85,78,65,40,56,x

B. 30