How many three-letter meaningful words can be formed from the letters of the word $TEAR$ beginning with $A$ without repeating any letter within that word?

Arrange the given words in alphabetical order and choose the one that comes first.

How many such pairs of letters are there in the word $EXCURSION$,each of which has as many letters between them in the word as they have in the English alphabet?

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

Two letters in the word $TRESENCE$ have as many letters between them in the word as in the alphabet and in the same order. Which one of the two letters comes earlier in the alphabet?

In the following series,count each $N$ which is immediately followed by $X$ but $X$ is not immediately followed by $T.$ How many such $N's$ are there?
$N, X, N, T, Q, M, N, X, T, M, X, N, X, C, N, Q, M, N, N, X, Q, N, X, T, X, N, A, M, X, N, X, M$