The set $A = \{ x : x \ne x \}$ represents:

If $A \subseteq B$,then $A \cap B$ is equal to

Determine whether the following set is finite or infinite:
$\{1, 2, 3, \ldots, 99, 100\}$

Write the solution set of the equation $x^2 + x - 2 = 0$ in roster form.

Are the following pair of sets equal? Give reasons.
$A = \{ x : x \text{ is a letter in the word } \text{FOLLOW} \}$
$B = \{ y : y \text{ is a letter in the word } \text{WOLF} \}$

Let $A = \{1, 2, \{3, 4\}, 5\}$. Which of the following statements is incorrect and why?
${1, 2, 5} \in A$