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

Find out the wrong term from the given series.
$1, 2, 6, 15, 31, 56, 91$

Fill in the blank space for the given series with the correct alternative.
$5, 17, 37, 65, (\ldots), 145$

If $2$ is subtracted from each odd digit and $3$ is added to each even digit in the number $3675249$,how many digits will appear twice in the new number thus formed?

Study the following arrangement carefully and answer the question given below.
$Q, E, *, P, M, 8, R, A, @, C, 9, U, H, W, \#, J, Z, S, \beta, Y, N, 5, \,G,I,T$
How many such vowels are there in the above arrangement,each of which is immediately followed by a symbol?

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?