1.

How to solve this question.

Answer»
(a + b + c) ^{2}  = a {}^{2}  + b {}^{2}  + c {}^{2}  + 2(ab + bc + ca)
(a + b + c) ^{2}  = 250 + 6
a + b + c =  \sqrt{256}
a + b + c = 16




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