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Let $A$ be an $n \times n$ matrix of the following form. $$A = \begin{bmatrix}3&1&0&0&0&\ldots&0&0&0\\ 1&3&1&0&0&\ldots&0&0&0\\ 0&1&3&1&0&\ldots&0&0&0\\ 0&0&1&3&1&\ldots&0&0&0\\ \…
Answer: D
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