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

Fill in the blank space for the given series with the correct alternative.
$1, 2, 6, 24, (...)$

Two terms have been put within brackets. Mark your answer as:
$2, 3, (6), 11, 18, (30), 38$

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?

How many such pairs of digits are there in the number $7326985$ each of which has as many digits between them in the given number as when the digits of the number are rearranged in ascending order within the number?

Choose the correct alternative to complete the series: $a \_ n \_ b \_ \,, \, \_ n c b \_ \,, \, \_ n c b$