Let A=⎛⎜⎝1−1001−1001⎞⎟⎠ and B=7A20−20A7+2I, where I – InterviewSolution

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1.	Let A=⎛⎜⎝1−1001−1001⎞⎟⎠ and B=7A20−20A7+2I, where I is an identity matrix of order 3×3. If B=[bij], then b13 is equal to
Answer» Let $A = ⎛ ⎜ ⎝ \begin{matrix} 1 & - 1 & 0 0 & 1 & - 1 0 & 0 & 1 \end{matrix} ⎞ ⎟ ⎠$ and $B = 7 A^{20} - 20 A^{7} + 2 I,$ where $I$ is an identity matrix of order $3 \times 3$ . If $B = [b_{i j}],$ then $b_{13}$ is equal to

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