In the following question, which one set of letters when sequentially placed at the gaps in the given letter series shall complete it? 

_cca_a_ca_ac_ab

Which letter should be 7th to the right of the 12th letter from left, if first half of the alphabet series is reversed?

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
TOM, UMP, VKS, ?, XGY

Which letter-cluster will replace the question mark (?) to complete the given series?

LE, OJ, UO, DT,?

Directions : Study the following alphanumeric series carefully and answer the questions given below:

12AIFR                  42 WBOL                             63EOCN                15TVMR               75GYTR

How many meaningful words can be formed from the letters of the words which are attached with the numbers in which At least one digit is even digit in the given alphanumeric series?

Which letter-cluster will replace the question mark (?) to complete the given series?

abCD, fgHI, ?, stUV, abCD

Which of the following letter-clusters will replace the question mark (?) and complete the following letter-cluster series?
 DW, FU, GT, IR, JQ, ?

Select the option that represents the letters that, when sequentially placed from left to right in the blanks below, will complete the letter series.
 _ M o N _ _ _ o M _ _ o _ _o M _ N o J o