Question

interval and set notation for X<3

Answer 1

Interval :
\[] - \infty ; 3[ \]
Set builder :
\[\left \{ x | x \in \mathbb{R}, x \in ] - \infty ; 3[\right \}\]

Answer 2

Interval:\[(-\infty,3)\]
Set Builder:\[\{x| (x \in \mathbb{R}) \wedge (x < 3)\}\]