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Determinantseasy
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Given det⁡(abcd)=10\det \begin{pmatrix} a & b \\ c & d \end{pmatrix} = 10det(ac​bd​)=10, what is det⁡(2a2bcd)\det \begin{pmatrix} 2a & 2b \\ c & d \end{pmatrix}det(2ac​2bd​)?