What should come next in the following letter series?
$nsi, org, pqe, qpc, ?$

How many such digits are there in the number $5231698$ each of which is as far away from the beginning of the number as when the digits are rearranged in ascending order?

Study the following arrangement carefully and answer the questions given below:
$R, 4, E, J, 5, T, 1, A, M, Q, 3, 8, N, I, K, 7, W, F, 6, D, 9, U, 2, Y, V$
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 correct alternative for the missing term in the series: $? , ayw, gee, mki, sqo$

How many such pairs of digits are there in the number $947863512$,each of which has as many digits between them in the number as they have between them when arranged in descending order?

Fill in the blank space for the given series with the correct alternative.
$0, 4, 6, 3, 7, 9, 6, (...), 12$