Linear Algebra MCQ

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• Which one of the following equations is a correct identity for arbitrary 3 × 3 real matrices P, Q and R?
  ক

  P(Q + R) = PQ + RP

  খ

  (P - Q)² = P² - 2PQ + Q²

  গ

  det (P + Q) = det P + det Q

  ঘ

  (P + Q)² = P² + PQ + QP + Q²