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Question

A matrix A of order 3 × 3 has determinant 5. What is the value of |3A|?

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Solution

If A = ai j is a square matrix of order n and k is a constant, thenkA = kn A Here, Number of rows = n k is a common factor from each row of k3A = 33A = 27 × 5 = 135 Given matrix is 3×3 such that A = 5Thus, 3A = 135

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