Which term will replace the question mark in the series:
$ABD, DGK, HMS, MTB, SBL, ?$

Fill in the blank space for the given series with the correct alternative.
Which term of the series $5, 8, 11, 14, \ldots$ is $320$ (in $^{th}$)?

What should come next in the following number sequence?
$2, 2, 3, 2, 3, 4, 2, 3, 4, 5, 2, 3, 4, 5, 6, 2, 3, 4, 5, 6, 7, 2, 3, 4$

Fill in the blank space for the given series with the correct alternative.
$1, 2, 3, 6, 9, 18, (\ldots), 54$

Find out the wrong term from the given series.
$125, 126, 124, 127, 123, 129$

The positions of the first and the fifth digits in the number $53216894$ are interchanged. Similarly,the positions of the second and the sixth digits are interchanged,and so on. Which of the following will be the second from the right end after the rearrangement?