# NCERT Class 11-Math's Exemplar Chapter 1 Sets CBSE Board Problems

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Question 11:

Let U be the set of all boys and girls in a school, G be the set of all girls in the school, B be the set of all boys in the school, and S be the set of all students in the school who take swimming. Some, but not all, students in the school take swimming. Draw a Venn diagram showing one of the possible interrelationship among sets U, G, B and S.

Question 12:

For all sets A, B and C, show that

Determine whether each of the statement in Exercises is true or false. Justify your answer.

Given: There are three sets A, B and C

To prove:

Let

Let y

and

and

We know:

and

From (i) and (ii):

Question 13:

For all sets A and B,

True

Question 14:

For all sets A, B and C,

False

Question 15:

For all sets A, B and C, if A ⊂ B, then

True

Question 16:

For all sets A, B and C, if A ⊂ B, then

True

Question 17:

For all sets A, B and C, if and , then .

True

Using properties of sets prove the statements given in Exercises 18 to 22

Question 18:

For all sets A and B,

Given: There are two sets A and B

To prove:

Take L.H.S

Distributive property of set:

= R.H.S

Hence Proved

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