Union of Sets

Q.

If
A = {1, 2, 3, 4}

B = {3, 4, 5, 6, 7}

C = {6, 7, 8, 9}

D = {7, 8, 9, 10}

$$\begin{array}{cc}ColumnA& ColumnB\\ 1.A\cup B& a.\{3,4,6,7\}\\ 2.A\cap B& b.\varnothing \\ 3.(B\cap C)\cup D& c.\{3,4\}\\ 4.B\cup C\cup D& d.\{3,4,5,6,7,8,9,10\}\\ 5.(A\cap B)\cap (B\cup C)& e.\{1,2,3,4,5,6,7\}\\ & f.\{6,7,8,9,10\}\\ & g.\{7\}\end{array}$$

1. 1 - e, 2 - c, 3 - f, 4 -d, 5-c

2. 1 - e, 2 - c, 3 - f, 4 -d, 5-a

3. 1 - b, 2 - a, 3 - c, 4 -e, 5-f

4. 1 - b, 2 - a, 3 - c, 4 -e, 5-c

Q.

Write down the union of the following pair of sets.

$E=\{3,4,5\}$ ; $F=\{4,5,6\}$

Q. If the sets $A$ and $B$ are defined as
$A=\{x:x=2n,n\in N,n<100\}B=\{x:x=3n,n\in N,n<100\}$
then, the number of elements in $AUB$ is

1. $165$
2. $198$
3. $99$
4. $0$