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1. ${(a - b)}^{2}$

Answer: Option B

Explanation:

{(a - b)}^{2} = a^{2} - 2 a b + b^{2} = 5^{2} - 2.5 . (- 5) + {(- 5)}^{2} = 25 + 50 + 25 = 100

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