# NCERT Solutions for Class 12 Maths Chapter 1 Exercise 1.2

NCERT Solutions for Class 12 Maths Chapter 1 Exercise 1.2 Relations and Functions in Hindi Medium as well as English Medium for all boards using NCERT Books as a course books, updated for session 2021-2022.

UP Board Solutions and NCERT Solutions are applicable for CBSE Board, UP Board – intermediate (Senior Secondary), Bihar Board, Uttarakhand board, Madhya Pradesh (MP Board) and the other state boards also which are following NCERT Books in Secondary and Senior Secondary Education.## NCERT Solutions for Class 12 Maths Chapter 1 Exercise 1.2

### Class 12 Maths Exercise 1.2 Solutions in Hindi & English

Class: 12 | Maths (English and Hindi Medium) |

Chapter 1: | Exercise 1.2 |

### 12th Maths Exercise 1.2 Solutions

NCERT Solutions for Class 12 Maths Chapter 1 Exercise 1.2 Relations and Functions in English & Hindi Medium for CBSE, Madhya Pradesh Board, UP Board, Bihar Board, Uttarakhand and all other board using NCERT Books 2021-22. Download Offline Apps based on latest CBSE Syllabus for new session. Join the discussion forum to solve your doubts related to NIOS or CBSE Board.

#### Class 12 Maths Exercise 1.2 Solution in Videos

#### About 12 Maths Exercise 1.2

In Exercise 1.2, the questions are based on concept of one – one, onto, injective, surjective, bijective, invertible function, etc. If the function is invertible, then we have to find inverse also. If for each element in domain, there is one and only one element in co-domain, then it is called one-one. Similarly, if for each element in range, there is one and only one element in domain, then it is onto. When a function is one – one as well as onto, it is said to be invertible function.

##### Important Terms related to Exercise 1.2

1. One-One Function :f : A → B is said to be one-one if distinct elements in A have distinct images in B. i.e. ∀ x1, x2 ∈ A such that x1 ≠ x2 ⇨f (x1) ≠ f(x2).

2. Onto function (surjective): A function f :A→B is said to be onto iff Rf = B i.e. ∀ b ∈ B, there exists a ∈ A such that f (a) = b

3. Bijective Function : A function which is both injective and surjective is called bijective function.

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##### What are the main topics from exercise 1.2 in 12th Maths for term 1?

The main topics that students will study in exercise 1.2 of class 12th Maths are:

- 1. One-one (Injective) Functions.
- 2. Many-one Functions.
- 3. Onto (Surjective) Functions.
- 4. Bijective Functions.

##### Is exercise 1.2 of CBSE Grade 12th Maths the shortest one?

Yes, exercise 1.2 of chapter 1 of grade 12th Maths is the shortest exercise compared to other exercises of chapter 1. Exercise 1.2 of 12th Maths has eight examples (examples 7, 8, 9, 10, 11, 12, 13, 14) and 12 questions.

##### How many days are needed to complete exercise 1.2 of grade 12th Maths?

If students can give 2 hours per day to exercise 1.2 of class 12th Maths, they need 2-3 days to complete exercise 1.2 of class 12th Maths. This time is an approximate time. This time can vary because no students can have the same working speed, efficiency, etc.

##### Which questions are the most important questions of exercise 1.2 of 12th for 1st Term Exam?

All the questions and examples of exercise 1.2 of class 12th Maths are important from the exam point of view, but some problems of this exercise are most important for the exams and can come in the board exam. These problems are examples 11, 12, 13, 14 and questions 2, 3, 4, 5, 8, 9, 10.