39
MCQ (Single Correct Answer)
If sets $A$ and $B$ are defined as $A=\left\{(x, y) \left\lvert\, y=\frac{1}{x}\right., 0 \neq x \in R\right\}, B=\{(x, y) \mid y=-x, x \in R$,$\} . Then,$
A
$A \cap B=A$
B
$A \cap B=B$
C
$A \cap B=\phi$
D
$A \cup B=A$
40
MCQ (Single Correct Answer)
If $A$ and $B$ are two sets, then $A \cap(A \cup B)$ equals to
A
$A$
B
$B$
C
$\phi$
D
$A \cap B$
41
MCQ (Single Correct Answer)
If $A=\{1,3,5,7,9,11,13,15,17\}, B=\{2,4, \ldots, 18\}$ and $N$ the set of natural numbers is the universal set, then $\left(A^{\prime} \cup(A \cup B) \cap B^{\prime}\right)$ is
A
$\phi$
B
N
C
A
D
B
42
MCQ (Single Correct Answer)
If $S=\{x \mid x$ is a positive multiple of 3 less than 100 $\}$ and $P=\{x \mid x$ is a prime number less than 20$\}$. Then, $n(S)+n(P)$ is equal to
A
34
B
31
C
33
D
41
43
MCQ (Single Correct Answer)
If $X$ and $Y$ are two sets and $X^{\prime}$ denotes the complement of $X$, then $X \cap(X \cup Y)^{\prime}$ is equal to
A
$X$
B
$Y$
C
$\phi$
D
$X \cap Y$