Complement of Set

Q. If $U=\{1,2,3,4,5\}$ and $A=\{2,5\}$, then $A^{\prime }=$______.

1. $\varphi$
2. {1, 3, 4}
3. {2, 5}
4. {1, 2, 3, 4, 5}

Q. Of a total of 300 users who make video calls, 75 people use Viber, 45 use Skype and 30 use both. The no. of people who use neither Viber nor Skype is ______.

1. 210
2. 270
3. 100
4. 175

Q. Find the complement of set A = {x : x is an integer, x<3}.

1. {3, 4, 5...}
2. {4, 5, 6...}
3. {-4, -5, ...}
4. {-5, -6, ...}

Q. If $U=\{1,2,3,4,5\}$ and $A=\{2,5\}$, then $A^{\prime }=$

1. $\{1,3,4\}$
2. $\{1,2,3,4,5\}$
3. $\{2,5\}$
4. $\varphi$

Q. If $U=\{1,2,3,4,5\}$ and $A=\{2,5\}$, then $A^{\prime }=$

1. $\{1,3,4\}$
2. $\{1,2,3,4,5\}$
3. $\{2,5\}$
4. $\varphi$

Q. The complement of universal set is ____ set.

1. null
2. finite
3. infinite
4. singleton

Q.

If $U=\{1,2,3,4,5,6,7,8,9,10\};$ $D=\{1,3,6,9,10\}$ then find $D$also find $n(D)$.

Q. Pair the number of elements in the corresponding sets for the following venn diagram.

1. ${\text{A}}^{{}^{\prime }}$
2. ${\text{B}}^{{}^{\prime }}$
3. $\text{U}$
4. 10
5. 6
6. 5