# Question 1, Exercise 2.1

Solutions of Question 1 of Exercise 2.1 of Unit 02: Matrices and Determinants. This is unit of Model Textbook of Mathematics for Class XI published by National Book Foundation (NBF) as Federal Textbook Board, Islamabad, Pakistan.

## Question 1(i)

Find the order of the following matrix $A=\left[\begin{array}{lll}1 & 3 & 0 \\ 2 & 0 & 1\end{array}\right]$

** Solution. **

\begin{align}\text{Order of A}&= 2\times 3\end{align}

## Question 1(ii)

Find the order of the following matrix $B=\left[\begin{array}{ll}1 & 2 \\ 2 & 3 \\ 3 & 4\end{array}\right]$

** Solution. **

\begin{align}\text{Order of B}&= 3\times 2\end{align}

## Question 1(iii)

Find the order of the following matrix $C=\left[\begin{array}{l}1 \\ 6 \\ 9\end{array}\right]$.

** Solution. **

\begin{align}\text{Order of C}&= 3\times 1\end{align}

## Question 1(iv)

Find the order of the following matrix $D=\left[\begin{array}{llll}2 & 1 & 6 & 8\end{array}\right]$.

** Solution. **

\begin{align}\text{Order of D}&= 1\times 4\end{align}

## Question 1(v)

Find the order of the following matrix $E=[3]$.

** Solution. **

\begin{align}\text{Order of E}&= 1\times 1\end{align}

## Question 1(vi)

Find the order of the following matrix $F=\left[\begin{array}{ll}3 & 6 \\ 9 & 2\end{array}\right]$.

** Solution. **

\begin{align}\text{Order of F}&= 2\times 2\end{align}

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