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OpenStudy (anonymous):
Let B be the matrix obtained from A after the row operations 2 r 3 ---> r 3, r 1 <--> r 2, 4 r 1 + r 3 --> r 3, and -2 r 1 + r 4 have been performed. If det (B) = 2, find det (A). Please explain. Thank you!
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