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The square root of $a^{2} + b^{2} + c^{2} - 2 ab - 2 bc + 2 ca is$

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a + b + c

a - b + c

a + b - c

a - b - c

answer is C.

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Detailed Solution

$\sqrt{a^{2} + b^{2} + c^{2} - 2 ab - 2 bc + 2 ca} = \sqrt{{(a - b + c)}^{2}} = a - b + c$

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