Which of the following series observes the rule,"Skip in between adjacent letters,increasing one letter more each time to build a set of letters"?

If we make a meaningful word with the first,fourth,ninth and fourteenth letters of the word $ADMINISTRATION$,which of the following will be the third letter of that word from the right end of that word?

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$N, A, E, H, L, D$
$1, 2, 3, 4, 5, 6$

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$R, E, S, T, L, U$
$1, 2, 3, 4, 5, 6$

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

$A$ group of letters is given which are numbered $1, 2, 3, 4, 5$ and $6$. Below are given four alternatives containing combinations of these numbers. Select the combination of numbers so that the letters arranged accordingly form a meaningful word.
$L, A, E, M, V, R$
$1, 2, 3, 4, 5, 6$