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Solving a tricky math equation step by step

Struggling with a tricky math equation? In this video, I solve it step by step with a clear, beginner-friendly explanation.
Solution: det (A) = −5, and for n×n matrix adj (A) has determinant (det A)^ (n−1). Here n = 3, so det (B) = (−5)^ (2) = 25.