Competition problem — Algebra — Maths Olympiad Prep

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Algebra Difficulty 4.7 AIME Find the answer

6. Given that $x$ , $y$ , and $z$ are real numbers, and $x^{2}+y^{2}+z^{2}=1$ . Then $m=x y+y z+z x(\quad)$ .

Pick one

Solution

6.C

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