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  4. If p, q, r are 3 real numbers satisfying the matrix equation, [p q r][3&4&1 3&2&3 2&0&2]=[301] then 2 p+ q-r equals :

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Q. If $p, q, r$ are $3$ real numbers satisfying the matrix equation, $[p q r]\begin{bmatrix}3&4&1\\ 3&2&3\\ 2&0&2\end{bmatrix}=[301]$ then $2 p+ q-r$ equals :

Matrices

Solution:

Correct answer is (a) -3