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 should be fourth to the left of the twelfth letter from the right if the second half of the given alphabet is reversed?

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

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

Number of letters skipped in between adjacent letters in the series is in the order of $1^{2}, 2^{2}, 3^{2}$. Which of the following series observes the rule given above?

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 $Z$?
$A, M, B, Z, A, N, A, A, B, Z, A, B, A, Z, B, A, P, Z, A, B, A, Z, A, B$

If in the word $CERTIFICATE$,the first and the seventh letters are interchanged,similarly the second and the eighth letters are interchanged and so on up to the fifth and eleventh letters are interchanged,then which letter will be third to the right of sixth from the right end?