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

Answer: Option C

Explanation:

(a^{2} + b^{2}) = 1 / 2 \{{(a + b)}^{2} + {(a - b)}^{2}\} = \frac{1}{2} \{{(13)}^{2} + {(3)}^{2}\} = \frac{1}{2} (169 + 9) = \frac{1}{2} \times 178 = 89

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