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

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**Question 3:**

If X and Y are subsets of the universal set U, then show that

(i)

(ii)

(iii)

**Answer:**

(i)

(ii)

(iii) Note that

Hence the result follows.

**Example 4:**

Given that , then

(i) Write the subset A of N, whose element are odd numbers.

(ii) Write the subset B of N, whose element are represented by , where.

**Answer:**

(i)

(ii)

So, for

and so on. Therefore,

**Question 5:**

Given that . If represents any member of E, then, write the following sets containing all numbers represented by

(i)

(ii)

**Answer:**

Given

(i) Let

Thus, for

and so on. Therefore, .

(ii) Let

So, for

and so on. Hence,

**Question 6:**

Let . If *n* represent any member of X, express the following as sets:

(i)

(ii)

(iii) is greater than .

**Answer:**

For , it is the given that , but .

Let,

Now, as

But

So,

Let

Here,

as and and there is no other element belonging to X such that .

(iii)

Let

Therefore,