Fill in the blank space for the given series with the correct alternative.
$2, 3, 8, 63, (\ldots)$

Find the missing term for the given series from the given alternatives:
$CMW, HRB, (?), RBL, WGQ, BLV$

Choose the correct alternative to complete the series: $abc....d....be....d....b...cda$

Study the following arrangement carefully and answer the question.
$O, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, S, 9, U, 2, Y, X$
Which of the following is the sixth to the left of the eleventh from the left end of the above arrangement?

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

Study the following arrangement carefully and answer the question.
$O, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, S, 9, U, 2, Y, X$
Which of the following is exactly in the middle between $A$ and $S$ in the above arrangement?