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1. $a^{2} + b^{2} = 45$

Answer: Option B

Explanation:

{(a - b)}^{2} = a^{2} + b^{2} - 2 a b = 3^{2} = 45 - 2 a b = 9 = 45 - 2 a b = 2 a b = 36 a b = 18

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