Verbal Reasoning - Mental Ability Questions

In each of the following questions, four words have been given out of which three are alike in some manner, while the fourth one is different. Choose the word which is different from the rest.

Find the next term in the following series. Z26, X24, V22, .........

Introducing a man, a woman said that, "He is the son of my mother's brother's father's son." Then how  is the woman related to the man?

If A = 1, AND = 19, then ANT = ?

If RESEARCH is $#!#%$&@ then SCARE is

If L denotes 'x', M denotes '÷' , P denotes '+' and Q denotes '-'  then 16P24M8Q6M2L3

In the following question, select the related letters from the given alternatives.
DJLQ : WQOJ : : DMSW : ?

At a college party 5 girls are sitting in a row. P is to the left of M and to the right of O. R is sitting to the right of N, but to the left of O. Who is sitting in the middle?