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In the matrix \(A=\begin{bmatrix}1&0\\0&2\end{bmatrix}\), what are the elements on the main (principal) diagonal?

Answer and explanation

Correct answer: 1, 2

Core idea: The main diagonal consists of entries where the row and column indices are equal (i.e. \(i=i\)), running from top-left to bottom-right. For \(A=\begin{bmatrix}1&0\\0&2\end{bmatrix}\), we have \(a_{11}=1\) and \(a_{22}=2\), so the diagonal elements are 1 and 2. The closest distractor D (0, 2) is wrong because its first entry 0 is \(a_{12}\), not a diagonal entry. Exam tip: Check positions with equal row and column indices (\(a_{11},a_{22},a_{33},\dots\)) to find the main diagonal quickly.

Related tags

MatricesMain-DiagonalElements2X2-MatrixIntroduction To MatricesMatrixMathematicsClass 12 Mcq

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