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# A problem from the quiz

Home Forums Math Olympiad, I.S.I., C.M.I. Entrance A problem from the quiz

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Jatin Kr Dey
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Try to use $$\displaystyle (a^2+b^2+c^2-ab-bc-ca)= \frac{1}{2} [(a-b)^2+(b-c)^2+(c-a)^2]$$

then proceed by the RMS – AM   ineqality .

• This reply was modified 1 week, 6 days ago by  Jatin Kr Dey.
• This reply was modified 1 week, 6 days ago by  Jatin Kr Dey.
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