a_cacbc_baca_ _b 

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.

a_b_ba_b_ba 

_aa_ba_bb_ab_aab 

In the given word ‘SPLENDOR ’, in which consonant changed into its previous letter and the vowel into its next letter (according to the alphabetical order) and then all letters are arranged in alphabetical order from left to right then which of the following letter is fifth from the left end?

Which one set of letters when sequentially placed at the gaps in the given letter series shall complete it.

d_ _td_s_d_st

Directions: In each of the following questions, find out which of the letter series follows the given rule.
Number of letters skipped in between adjacent letters in the series is two. 

oopqop_qoo_qo_oqo_pq