One term in the number series is wrong or missing. Find it.
$2, 3, 5, 8, 13, 34$

What will come in place of the question mark $(?)$ in the following alphabet series?
$CD, FG, JK, ?, UV$

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

These questions are based on the following arrangement. Study it carefully and answer the questions.
$8, H, \%, 3, 7, T, A, 4, \#, 6, B, I, @, R, 1, Q, \star, L, E, 2, K, \,U,5,9$
Four of the following five are alike in a certain way on the basis of their positions in the above arrangement and so form a group. Which is the one that does not belong to the group?

Study the following arrangement carefully and answer the question.
$O, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, S, 9, U, 2, Y, X$
Four of the following five are alike in a certain way based on their positions in the above arrangement and so form a group. Which is the one that does not belong to this group?

Choose the alternative that will complete the series:
$aku, fpz, kue, (\ldots), ueo, zjt$