Formation and order of matrix

Chapter 3 Class 12 Matrices
Concept wise

### Transcript

Ex 3.1 , 1 In the matrix A = [■8(2&5&19&−7@35&−2&5/2&12@√3&1&−5&17)], write: The order of the matrix Since the matrix has 3 rows and 4 columns Order of matrix A = 3 × 4 Ex 3.1 , 1 In the matrix A = [■8(2&5&19&−7@35&−2&5/2&12@√3&1&−5&17)], write: (ii) The number of elements, Method 1 By counting, there are total 12 elements Method 2 Number of rows = 3 Number of column = 4 Total elements = 3 × 4 = 12 elements Ex 3.1 , 1 In the matrix A = [■8(2&5&19&−7@35&−2&5/2&12@√3&1&−5&17)], write: (iii) Write the elements a13, a21, a33, a24, a23 a13 is first row, third column ∴ a13 = 19 a21 is second row, first column ∴ a21 = 35 a33 is third row, third column ∴ a33 = −5 a24 is second row, fourth column ∴ a24 = 12 a23 is second row, third column ∴ a23 = 𝟓/𝟐

#### Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 14 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.