# NCERT Class 11-Math՚S Exemplar Chapter 1 Sets CBSE Board Problems (For CBSE, ICSE, IAS, NET, NRA 2022)

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**Question 19**:

For all sets A and B,

**Answer**:

Given: There are two sets A and B

To prove:

Take L. H. S

Distributive property of set:

= R. H. S

Hence Proved

**Question 20**:

For all sets A and B,

**Answer**:

Given: There are two sets A and B

To prove:

Take L. H. S

Distributive property of set:

**Hence Proved**

**Question 21**:

For all sets A and B,

**Answer**:

Given: There are two sets A and B

To prove:

Take L. H. S

Distributive property of set:

Hence Proved

**Question 22**:

Is an empty set? Justify your answer.

**Answer**: