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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.

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Opinions expressed by Entrepreneur contributors are their own. Businesses often follow a define-plan-execute method of problem solving: spend time up front rigorously defining a problem, develop a ...

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