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What is the value of \(a_{21}\) in the matrix \(A=\begin{bmatrix}6&7&8\\9&10&11\end{bmatrix}\)?

Answer and explanation

Correct answer: 9

By notation \(a_{ij}\) denotes the element in the i-th row and j-th column. Thus \(a_{21}\) refers to the element in row 2, column 1. In the given matrix that entry is 9, so the correct answer is 9. For reference, 6 is \(a_{11}\) (row 1, column 1) and 7 is \(a_{12}\), so those options are incorrect. Exam tip: always read the subscript as (row, column) — i first, j second.

Related tags

MatricesElementIndicesRow-ColumnNotationIntroduction To MatricesMatrixMathematics

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