Let \(A=\left(\begin{array}{ccc}1 & -1 & 0 \\ 0 & 1 & -1 \\ 0 & 0 & 1\en....

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Let \(A=\left(\begin{array}{ccc}1 & -1 & 0 \\ 0 & 1 & -1 \\ 0 & 0 & 1\end{array}\right)\) and \(B=7 A^{20}-20 A^7+2 I\), where \(I\) is an identity matrix of order \(3 \times 3\). If \(B=\left[b_{i j}\right]\), then \(b_{13}\) is equal to......... 📲PW App Link - https://bit.ly/YTAI_PWAP 🌐PW Website - https://www.pw.live



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