If A= [ array ccc 1 & -3 & 2 2 & k & 5 4 & 2 & 1 array ] is a singular matrix, then k is…

Mathematics · JEE Main · NTA ExamsMatrices and Determinants

\[\text { If } A=\left[\begin{array}{ccc} 1 & -3 & 2 \\ 2 & k & 5 \\ 4 & 2 & 1 \end{array}\right]\] is a singular matrix, then k is equal to
  1. –1
  2. 8
  3. 4
  4. –8

Answer

(D) –8

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