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1. $a^{2} + b^{2}$

Answer: Option D

Explanation:

দেওয়া আছে, a+b=8 a b = 15 a^{2} - b^{2} = {(a + b)}^{2} - 2 a b = 8^{2} - 2 \times 15 = 64 - 30 = 34

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