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Which of the following best defines a matrix of order $m\times n$?
AA square arrangement of $m+n$ numbers
BA rectangular array of $mn$ numbers arranged in $m$ rows and $n$ columns
CA determinant having $m$ rows and $n$ columns
DA collection of $m$ numbers written in $n$ brackets
Answer & Solution
Correct answer: B. A rectangular array of $mn$ numbers arranged in $m$ rows and $n$ columns
A matrix of order $m\times n$ is a rectangular array containing $mn$ elements arranged in $m$ horizontal rows and $n$ vertical columns. It need not be square, so option A is too restrictive.
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