In the arrangement $P, 2, 6, M, 9, K, S, 4, V, 7$,the positions of the $1^{st}$ and the $6^{th}$ elements are interchanged,those of the $2^{nd}$ and the $7^{th}$ are interchanged,and so on. Then,which of the following will be the $4^{th}$ element from the left end in the new arrangement?

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?

The following questions are based on the five three-digit numbers given below:
$972, 526, 487, 359, 251$
If the positions of the digits of each of the numbers are interchanged such that the first digit becomes the second,the second digit becomes the third,and the third digit becomes the first,which of the following will be the highest?

Find the missing term for the given series from the given alternatives:
$C, B, A, E, D, Z, G, F, (?)$

Fill in the blank space for the given series with the correct alternative.
$4, 32, 128, (\ldots)$

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