Order of a matrix for JEE

Formula

\(A=[a_{ij}]_{m\times n}\) has order \(m\times n\) with \(m\) rows and \(n\) columns.

Variables: \(a_{ij}\): entry in the \(i\)-th row and \(j\)-th column.

Conditions: Applicable to any matrix.

Identifying dimensions, checking possibility of operations.