If a + b + c = 11 and a2+b2+c2=81, find ; ab+bc+ca. – InterviewSolution

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1.	If a + b + c = 11 and a2+b2+c2=81, find ; ab+bc+ca.
Answer» If a + b + c = 11 and $a^{2} + b^{2} + c^{2} = 81$ , find ; $a b + b c + c a$ .

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