Question 15 Marks
Consider the following sets :
$\begin{array}{l}
A=\{x: x \in N, x \text { is a factor of } 3\} \\
B=\{x: x \in N, x \text { is a factor of } 5\} \\
C=\{x: x \in N, x \text { is a factor of } 9\}
\end{array}$
1. $A \cap B=$ ?
(a) $\{x: x \in N, x$ is a factor of 3 or 5$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of both 3 and 5\}
(c) $\{x: x \in N, x$ is a factor of 15$\}$ $\quad$ (d) Both (b) and (c)
2. $A \cup B=$ ?
(a) $\{x: x \in N, x$ is a factor of either 3 or 5$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of 3 or 5 or both $\}$
(c) $\{x: x \in N, x$ is a factor of 15$\}$ $\quad$ (d) $\{x: x \in N, x$ is a factor of both 3 and 5$\}$
3. $A \cup C=$ ?
(a) $\{x: x \in N, x$ is a factor of 3$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of 9$\}$
(c) $\{x: x \in N, x$ is a factor of 27$\}$ $\quad$ (d) None of these
4. $A \cap C=$ ?
(a) $\{x: x \in N, x$ is a factor of 3$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of 9$\}$
(c) $\{x: x \in N, x$ is a factor of 27\} $\quad$ (d) None of these
5. How many of the following statements are true:
I. $A \subset B$ II. $A \subseteq C$ III. $B \subseteq A$ IV. $C \subseteq A$
(a) Nil $\quad$ (b) One
(c) Two $\quad$ (d) All
$\begin{array}{l}
A=\{x: x \in N, x \text { is a factor of } 3\} \\
B=\{x: x \in N, x \text { is a factor of } 5\} \\
C=\{x: x \in N, x \text { is a factor of } 9\}
\end{array}$
1. $A \cap B=$ ?
(a) $\{x: x \in N, x$ is a factor of 3 or 5$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of both 3 and 5\}
(c) $\{x: x \in N, x$ is a factor of 15$\}$ $\quad$ (d) Both (b) and (c)
2. $A \cup B=$ ?
(a) $\{x: x \in N, x$ is a factor of either 3 or 5$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of 3 or 5 or both $\}$
(c) $\{x: x \in N, x$ is a factor of 15$\}$ $\quad$ (d) $\{x: x \in N, x$ is a factor of both 3 and 5$\}$
3. $A \cup C=$ ?
(a) $\{x: x \in N, x$ is a factor of 3$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of 9$\}$
(c) $\{x: x \in N, x$ is a factor of 27$\}$ $\quad$ (d) None of these
4. $A \cap C=$ ?
(a) $\{x: x \in N, x$ is a factor of 3$\}$ $\quad$ (b) $\{x: x \in N, x$ is a factor of 9$\}$
(c) $\{x: x \in N, x$ is a factor of 27\} $\quad$ (d) None of these
5. How many of the following statements are true:
I. $A \subset B$ II. $A \subseteq C$ III. $B \subseteq A$ IV. $C \subseteq A$
(a) Nil $\quad$ (b) One
(c) Two $\quad$ (d) All
Answer
View full question & answer→1. D
2. B
3. A
4. B
5. B
2. B
3. A
4. B
5. B