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If \(A=\begin{bmatrix}1&2&3\\4&5&6\end{bmatrix}\), which is the third column of A?

Answer and explanation

Correct answer: \(\begin{pmatrix}3\\6\end{pmatrix}\)

A column of a matrix is the vertical list of entries. In the given matrix the third column takes the third entry from the first row (3) and the third entry from the second row (6), so it is \(\begin{pmatrix}3\\6\end{pmatrix}\). The closest distractor \(\begin{pmatrix}2\\5\end{pmatrix}\) is the second column, and \(\begin{pmatrix}4\\5\\6\end{pmatrix}\) has three entries and does not match the 2×3 matrix. Exam tip: read column entries top to bottom and use the column index to pick the correct vertical list.

Related tags

MatricesColumnsColumn-VectorMatrix-Indexing2X3-MatrixIntroduction To MatricesMatrixMathematics

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