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Assuming $X, Y, Z, W$ and $P$ are the matrices of order $2 \times n, 3 \times k, 2 \times p, n \times 3$ and $p \times k$ respectively. Choose the correct answer in Question 21 and 22 .
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Verified Answer
$$
7 X-5 Z=7 X_{2 \times n}-5 X_{2 \times}
$$
We can add two matrices if their order is same
$$
\therefore \quad n=p
$$
$\therefore \quad$ Order of $7 X-5 Z$ is $2 \times n$.
Hence, option (b) is correct $2 \times n$.
7 X-5 Z=7 X_{2 \times n}-5 X_{2 \times}
$$
We can add two matrices if their order is same
$$
\therefore \quad n=p
$$
$\therefore \quad$ Order of $7 X-5 Z$ is $2 \times n$.
Hence, option (b) is correct $2 \times n$.
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