Set Theory Questions

Let $X$ be the set of all persons living in a city. Persons $x,y\in X$ are said to be related as $x<y$ if $y$ is at least $5$ years older than $x$. Which one of the following is correct?

If $\ast$ is a binary operation on $A=\{1,2,3,4,5\}$ defined by the table below:∗12345111111212121311311412141511115Find the value of $(3\ast 3)\ast (4\ast 4)$.

Let $R$ be the relation on the set $\mathbb{R}$ of all real numbers defined by $aRb$ if $|a-b|\le 1$. Then $R$ is:

If $A=\{1,2,3\}$ and $R$ is a relation defined on $A$ such that $R=\{(1,1),(1,2),(2,3),(2,2),(3,3),(3,1)\}$. Then the relation $R$ is: