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1. $a^{2} + b^{2} = 25$

Answer: Option B

Explanation:

{দেওয়া আছে, a+b=7, a}^{2} {+b}^{2} =25 আমরা জানি, a^{2} {+b}^{2} = {(a + b)}^{2} -2ab \Rightarrow 25 = 7^{2} - 2 ab \Rightarrow 2 ab = 49 - 25 \Rightarrow ab = \frac{24}{2} = 12 ∴ 5 ab = 12 \times 5 = 60

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