As per National Highway Authority of India, which is the

Three of the following four letter-clusters are alike in a certain way and one is different.

Pick the odd one out. 

Which letter-cluster will replace the question mark (?) in the following series?

BDF, HKN, PRT, VYB, DFH, ?

Which of the following numbers will replace the question mark (?) in the given series?

115, 130, 122, 137, 129, ?

Select the figure from among the given options that can replace the question mark (?) in the following series and complete the pattern.

CALANDER is coded in a code as CLANAEDR. Find the code for CIRCULAR under the same rule.

Find the missing term:

9, 27, 31, 155, 161, 1127, ?

What should come in place of '?' in the given series?

14  85  511  3067  18403  ?

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?