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1. $a^{2} - 6 a + 1 = 0$

Answer: Option C

Explanation:

দেওয়া আছে, a^{2} -6a+1=0 \Rightarrow a^{2} + 1 = 6 a \Rightarrow \frac{a^{2} + 1}{a} = \frac{6 a}{a} \Rightarrow \frac{a^{2}}{a} + \frac{1}{a} = 6 \Rightarrow a + \frac{1}{a} = 6

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