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

Answer: Option B

Explanation:

দেওয়া আছে (a - b) = 3 এবং ab = 4 a^{2} + b^{2} = {(a - b)}^{2} + 2 ab = 3^{2} + 2 \times 4 = 9 + 8 = 17

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