Which term comes next in the series : YEB, WFD, UHG, SKI ?

A. QOL

In following questions, one term in number series is incorrect. - Find out the incorrect number 3, 5, 7, 9, 11, 13

D. 9

In alphabet series, some alphabets are missing which are given in that order as one of the alternatives below it. Choose the correct alternative. - aa _ aaa _ aaaa _ aaaa _ b

D. BBBA

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 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