How many independent words can $DETERMINATION$ be divided into without changing the order of the letters and using each letter only once?

Arrange the given words in alphabetical order and choose the one that comes in the second place:

Number of letters skipped in between adjacent letters in the series decreases by one. Which of the following series is observing the rule?

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
How many $A$'s are there in the following series which are immediately followed by $B$ as well as immediately preceded by $Z$?
$A, M, B, Z, A, N, A, A, B, Z, A, B, A, Z, B, A, P, Z, A, B, A, Z, A, B$

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

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?