The set $A = \{ x: x \in R, x^2 = 16 \text{ and } 2x = 6 \}$ equals

Which of the following sets is empty?

If $A = \{2, 3, 5\}$ and $B = \{2, 5, 6\}$,then $(A - B) \times (A \cap B)$ is:

Set $A$ has $m$ elements and Set $B$ has $n$ elements. If the total number of subsets of $A$ is $112$ more than the total number of subsets of $B$,then the value of $m \times n$ is

The solution set of $8x \equiv 6 \pmod{14}$,$x \in \mathbb{Z}$,is

If the number of elements in a set $A$ is $n(A) = 40$,$n(B) = 26$,and $n(A \cap B) = 16$,then what is the value of $n(A \cup B)$?