If a = 7, b = 5 and c = 3, then the value of a<sup>2</sup> + b<sup>2</sup> + c<sup>2</sup> - ab - bc - ca is? - Voclasses

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If a = 7, b = 5 and c = 3, then the value of a² + b² + c² - ab - bc - ca is?

12 - 12 0 8

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Answer: 12

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