Is the following a set? Justify your answer.
A team of eleven best cricket batsmen of the world.

Express the following statement using symbols.

The element $\text{'}x\text{'}$ does not belong to $\text{'}\mathrm{A}\text{'}$.

Express the following statement using symbols.

Express the following statement using symbols.

$\text{'}1\text{'}$ belongs to the set of Natural numbers.

Express the following statements using symbols.

$5\notin$ set of prime numbers

$\mathrm{S}=\{5, 6, 7\}$ implies $8\in \mathrm{S}$