A letter series is given below in which some letter are missing. Select the  option that gives the letters that can fill these blanks in that order.
a_ca_bab_ad_abc_db

Six friends A, B, C, D, E and F are standing in a row facing north. B stands exactly between F and D. E stands exactly between A and C. A is not a neighbor of D and F. C is not a neighbor of D but is to the immediate right of F. C stands between which of the following.

P is the father of T. T is the daughter of M. M is the daughter of K. then how is p related to K? 

Which of the following letter-clusters should replace # and % so that the pattern and relationship followed between the letter-cluster pair on the left side of :: is the same as that on the right side of ::?
 # : DKR :: PCL: %

Find the next term in the following series.
Z26, X24, V22, ____

A tree is seventh in a row of trees from either end of the row. How many trees are there in the row?

Choose the correct option from the following options.
8 : 9 ∷ 64 : ?

X, Q, K, F, ?