# NCERT Solutions for Class 12 Maths Chapter 3 Exercise 3.3

NCERT Solutions for Class 12 Maths Chapter 3 Exercise 3.3 Matrices in Hindi Medium as well as English Medium based on the Latest CBSE Curriculum 2018-19 for UP Board and CBSE board Students. Download (Exercise 3.3) in PDF file form here or go for study online given below.

## NCERT Solutions for Class 12 Maths Chapter 3 Exercise 3.3

### Class 12 Maths Chapter 3 Exercise 3.3 Matrices in English

NCERT Solutions for Class 12 Maths Chapter 3 Exercise 3.3 Matrices in English Medium. Option for download is also given in the first paragraph of this page. Get here all the exercises of Class 12 Mathematics Chapter 3, If you need Solutions in Hindi, CLICK HERE for Hindi Medium Solutions.        ### Class 12 Maths Chapter 3 Exercise 3.3 Matrices in Hindi

NCERT Solutions for Class 12 Maths Chapter 3 Exercise 3.3 Matrices Hindi Medium to study online. To download these in PDF, move to top of this page. These solutions are properly updated for the current academic session 2018-2019 for CBSE as well as UP Board students using NCERT Books. Get here all the exercises of Class 12 Mathematics Chapter 3, Go back to English Medium Solutions.        Go Back to Top of English Medium Solutions & Hindi Medium Solutions.

#### Extra Questions on Matrices with Answers

1. In a certain city there are 30 colleges. Each college has 15 peons, 6 clerks, 1 typist and 1 section officer. Express the given information as a column matrix. Using scalar multiplication, find the total number of posts of each kind in all the colleges.
2. Using determinants, find the equation of line passing through (0, 3) and (1, 1). [Answer: 2x + y = 3]
3. If A be any square matrix of order 3 × 3 and |A| = 5, then find the value of |adj(adjA)|. [Answer: 625]
4. There are two families A and B. There are 4 men, 6 women and 2 children in family A and 2 men, 2 women and 4 children in family B. The recommended daily allowance for calories is Man: 2400, woman: 1900, child: 1800 and for proteins is Man: 55 gm, woman: 45 gm and child: 33 gm. Represent the above information by matrices. Using matrix multiplication, calculate the total requirement of calories and proteins for each of the two families.
5. What is the number of all possible matrices of order 2 × 3 with each entry 0, 1 or 2. [Answer: 729]
6. Given a square matrix A of order 2 × 3 such that |A| = 12, find the value of |A.adjA|. [Answer: 1728]