Question

Matrices are denoted by capital letters. Now, consider the following matrices
$A=\left[\begin{array}{cc}-2& 5\\ 0& \sqrt{5}\\ 3& 6\end{array}\right]\text{ and }C=\left[\begin{array}{ccc}1+x& x^3& 3\\ \cos x& \sin x+2& \tan x\end{array}\right]$
Then, the horizontal lines of elements are said to constitute ... $A_1\dots$ of the matrix and the vertical lines of elements are said to constitute.. $A_2\dots$ of the matrices $A$ and $C$. Here, $A_1$ and $A_2$ are respectively

• A. rows and columns
• B. columns and columns
• C. columns or rows
• D. rows and rows

Answer 1

Answer: (A)

The horizontal lines of elements are said to constitute rows of the matrix and the vertical lines of elements are said to constitute columns of the matrices $A$ and $C$.