Singleton Set and Empty Set

Q.

What is a whole number?

Q.

If A is a subset of B, then A - B is ___.

1. A

2. B

3. a null set

4. a singleton set

Q.

Encircle prime numbers: $11,21,31,44,59,65,73,37,94,85$.

Q. Show that set $B=\{y:2y+1<3andy\in W\}$ is a singleton set.

Q.

What is the cardinal number of following sets?

The set of weeks having $8$days.

Q.

The set A = {0} is a ___ .

Q.

Identify the finite and infinite sets and find the cardinal numbers of the finite sets$.$

$D=\{........-3,-2,-1,0\}$

Q.

Identify the finite and infinite sets and find the cardinal numbers of the finite sets$.$

$C=\{x:x<5$and $x\in Z\}$

Q. Which of the following sets is a non-empty set?

1. {$x:x$ is a natural number, $x$ < 8 and $x$ > 12}
2. {$y:y$ is a point common to any two parallel lines}
3. {$q:q$ $\in$ I, $q$ > -1 and $q$ > 8}
4. {$p:p$ $\in$ I, $p^2$ < 0}

Q.

Write the cardinal number for the set $C=\left\{0\right\}$.

Q.

How many even prime numbers are there?

Q.

What is the cardinal number of the following sets?

The set of months of the years with names that begin with the letter $S$

Q.

If A = {prime numbers between 19 and 23}, then A is

1. A singleton set

2. A null set

3. None of the above

4. An infinite set

Q.

Use the square shown. Find the exact length $\mathrm{x}$ of a diagonal. Is this number a rational number or an irrational number? Explain.

Q.

A set that has one and only one element is called ___.

1. an empty set

2. an infinite set

3. a singleton set

4. a universal set

Q. Choose the correct pairs.

1. P={1, 2}&Q={a, b}
2. Equivalent sets
3. P={1, 2, 3...}
4. A={}
5. $A=\{\varnothing \}$
6. Infinite set
7. Null set
8. Singleton set

Q.

If A = set of even prime numbers, then A is ____.

1. a null set

2. a singleton set

3. an infinite set

4. not a set

Q. The power set of a singleton set has elements in all.

1. $1$
2. $0$
3. $2$
4. $4$

Q.

The set of even prime number is a/an ____.

1. empty set

2. singleton set

3. infinite set

4. equal set

Q.

The set of even prime numbers that are greater than 2 is a/an _____________.

1. singleton set

2. empty set

3. disjoint set

4. infinite set