# NCERT Class 11 Mathematics Solutions: Chapter 2 – Relations and Functions Miscellaneous Exercise Part 3 (For CBSE, ICSE, IAS, NET, NRA 2022)

Get unlimited access to the best preparation resource for IMO : fully solved questions with step-by-step explanation- practice your way to success. In Figure Definition of Function is Given

1. Let be a function from to defined by , for some integers . Determine .

Answer:

On substituting in

We obtain .

So, the respective values of are .

2. Let be a relation from defined by . Are the following true?

(i) , for all

(ii) , implies

(iii) implies .

Justify your answer in each case.

Answer:

Answer: (i)

It can be seen that ; however, .

Therefore, the statement “” is not true.

Answer: (ii)

It can be seen that because and .

Now, ; therefore,

Therefore, the statement is not true.

Answer: (iii)

It can be seen that because and .

Now, ; therefore,

So, the statement is not true.

3. Let . Are the following true?

(i) is a relation from

(ii) is a function from . Justify your answer in each case.

Answer:

It is given that

Answer: (i)

A relation from a non-empty set to a non-empty set is a subset of the Cartesian product .

It is observed that f is a subset of .

is a relation from .

Answer: (ii)

Since the same first element i.e.. , corresponds to two different images i.e.. , , relation is not a function.