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What is the value of \(a_{12}\) in \(A=\begin{bmatrix}1&2\\3&4\end{bmatrix}\)?

Answer and explanation

Correct answer: 2

By definition \(a_{ij}\) denotes the element in the i-th row and j-th column. So \(a_{12}\) is the element in the first row and second column. In the given matrix that entry is 2. Option A (1) is \(a_{11}\), while C (3) and D (4) are elements of the second row, so they are incorrect. Exam tip: read \(a_{ij}\) as “i-th row, j-th column” and locate row first, then column.

Related tags

MatricesElementIndexingRow-Column2X2-MatrixIntroduction To MatricesMatrixMathematics

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