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1. $(x - y) = 10, x y = 5$

Answer: Option B

Explanation:

দেওয়া আছে, x - y = 10 এবং xy = 5 x^{2} + y^{2} = {(x - y)}^{2} + 4 xy = {(10)}^{2} + 4.5 = 100 + 20 = 120

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