Question $4(0\mathrm{.}5$ point for each correct answer, max$2$ points$)$

Write the formal expression for the following logical conditions on a variable $x$ in a computer program.

Note, exercise $2$ and $4$ are, respectively, $1$ and $3$ negated with De Morgan's law.

$1.-10$

$2.$ Write the negation of conditions in point $1$ by using De Morgan's law.

$3.$ x not divisible by $3$ or x not $1$

$4.$ Write the negation of conditions in point $3$ by using De Morgan's law.