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

Answer: Option D

Explanation:

দেওয়া আছে, a + b = 3 এবং ab = 2 আমরা জানি, a^{2} + b^{2} = {(a + b)}^{2} - 2 ab = 3^{2} - 2 \times 2 = 9 - 4 = 5

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