In the following letter sequence,how many $n$'s are followed by $m$ but not preceded by $h$?
$a, g, r, h, t, n, m, b, c, n, m, l, b, u, v, n, m, h, e, r, h, n, m, g, f, e, h, n, m, e, c, n, m, w, q, a, n, m, h, l, b$

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
Which letter will be the sixth to the right of the eleventh letter from the right end of the alphabet?

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
If every alternate letter starting from $B$ is deleted from the given alphabet,which of the following will be the tenth letter from the right end?

Find which one word cannot be made from the letters of the given word.
$CONSTITUTIONAL$

The number of letters skipped between adjacent letters in the series decreases by $2$. Which of the following series follows this rule?

How many pairs of letters are there in the word $PENCIL$ which have as many letters between them in the word as in the alphabet?