Intersection and Union of Sets

Q.

If $A=\{x:x=n,n\in N,5\le n<9\},$

$B=\{3,4,5,6\}$ and

$C=\{x=2n,n\in N,n<5\},$ then

$B\cup (A\cap C)=$ ___.

1. $\{3,4,5,6\}$

2. $\{3,4,5,6,8\}$

3. $\{6,8\}$

4. $\{3,4,5,6,7\}$

Q. Given $U=\{x:x\in N,x\le 9\},$ $A=\{x:x\text{is divisible by 2}\}$ and $B=\{x:\frac{x}{3}\in N\},$ where $U$ is the universal set. Then, $(A\cup B)-(A\cap B)$ = ____. (3 mark)

Q. $1/r_1+1/r_2+1/r_3=1/r$

Q.

If U = {a, e, d}, A = {a, e} and B’ = { a, d}, then $A\cap B$= ___.

1. {e}

2. {d}

3. { a, d}

4. {a, e}

Q.

If $A=\left\{\text{Isosceles triangles}\right\}$ and $B=\left\{\text{Isosceles right-angled triangles}\right\},$ then which of the following statements is/are true?

1. $A\subseteq B$

2. $B\subseteq A$

3. $A\cup B=A$

4. $A\cap B=B$