SSC IB Security Assistant & MTS Mock Test Series 2023 Quantitative Aptitude Algebra Linear Equation in 2 Variable

x, y and z are real numbers. If x3 + y3 + z3 = 13, x + y + z = 1 and xyz = 1, then what is the value of xy + yz + zx?

1
1
2
-1
3
3
4
-3
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