If a 2 + b 2 + c 2 + 84 = 4(a - 2b + 4c), then \sqrt{ab−bc + ca} is equal to:

SSC CPO 24 Nov 2020 Shift 2 Paper

Question : 111 of 200

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If a² + b² + c² + 84 = 4(a - 2b + 4c), then

{√{ab−bc + ca}}

is equal to:

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