Singleton Set

Q. Let set A = {2, 4, 6, 8, 10} and set B = {1, 3, 5, 7, 9, 10}.
Find the following:
(i) n (A U B)
(ii) n (A ∩ B)
(iii) n (A - B)
(iv) n (B - A)
(v) (A ∪ B) - (A ∩ B)

Q.

In a set of natural numbers there exists a definite largest number.

1. True

2. False

Q.

Classify the following as finite, infinite or null sets.

(a) Set of odd numbers

(b) Set of persons living for three hundred years

(c) Set of letters in the word ‘TEACHER’

Q.

If A = {set of odd numbers less than 3}, then A is

1. Empty set

2. Singleton set

3. Infinite set

4. not a set

Q.

If A = {set of even prime number}, then A is

1. Singleton set

2. Infinite set

3. not a set

4. Empty set

Q.

Identify the following as null set or singleton set.

$\mathrm{G}=\mathrm{set}\mathrm{the}\mathrm{smallest}1-\mathrm{digit}\mathrm{number}$

Q.

If A – B = A, then $(A\cap B)$ = ___.

1. { }

2. A

3. $A\cup B$

4. B