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If \(A=[a_{ij}]_{2\times2}\) and \(a_{ij}=i+j\), what is the value of \(a_{22}\)?

Answer and explanation

Correct answer: 4

The rule given is \(a_{ij}=i+j\). For \(a_{22}\), the row index is \(i=2\) and the column index is \(j=2\), so \(a_{22}=2+2=4\). Option B (3) is incorrect — it would result from misreading indices as \(i=1,j=2\). Option D (5) is a simple arithmetic mistake. Exam tip: first identify the values of \(i\) and \(j\) clearly, then substitute into the formula.

Related tags

MatricesMatrix-ElementsElement-FormulaClass-12Introduction To MatricesMatrixMathematicsClass 12 Mcq

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