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

Answer: Option B

Explanation:

দ ে ও য় া আ ছ ে, a + b = 7, a^{2} + b^{2} = 25 আ ম র া জ া ন ি, a^{2} + b^{2} = {(a + b)}^{2} - 2 a b \Rightarrow 25 = {(7)}^{2} - 2 a b [ম ্ য া ন ব স ি য় ে] \Rightarrow 25 = 49 - 2 a b \Rightarrow 2 a b = 24 \Rightarrow a b = 12 ∴ 5 a b = 5 \times 12 = 60 . (A n s)

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