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 even letter beginning from $B$ is replaced by an odd number beginning with $3$,which letter/number will be the third to the right of the tenth number/letter counting from your right?

$A$ meaningful word starting with $A$ is made from the first,the second,the fourth,the fifth and the sixth letters of the word $'CONTRACT'$. Which of the following is the middle letter of the word?

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

Each of the following questions is based on the following alphabet series.
$A, B, C, D, E, F, G, H, I, J, K, L, M$
$N, O, P, Q, R, S, T, U, V, W, X, Y, Z$
If the letters of the given alphabet interchange positions,so that $A$ takes the place of $Z$ and $Z$ takes the place of $A$; $B$ takes the place of $Y$ and $Y$ takes the place of $B$ and so on,what will be the thirteenth letter from the right?

If it is possible to make a meaningful word with the second,the sixth,the ninth and the twelfth letters of the word $CONTRIBUTION$,which of the following will be the last letter of that word? If more than one such words can be made,give $M$ as the answer and if no such word is there,give $X$ as the answer.

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