Choose the correct alternative for the missing term in the series:
$BD, GI, LN, QS, ?$

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?

Choose the correct alternative to complete the series: $m, n, o, p, q, o, p, q, r, s, \dots$

What will be the next term in the series: $BDF, CFI, DHL, ?$

Fill in the blank space for the given series with the correct alternative.
$1, 4, 9, 16, 25, (\ldots)$

To answer these questions, study the following arrangement of digits, letters and symbols carefully.

$6, N,P ,=,@, 7,1 ,\&, R, T, 3, L, ,B, \star, E ,4,\# ,8, G,H ,\$, 5, K,M ,?, 2, D,C$

If all the digits in the arrangement are deleted, which of the following will be midway between the $3^{rd}$ and the $15^{th}$ elements from the left end?