Q. 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?
A) 1
B) -1
C) -3
D) 3
✔ Correct Answer: -3
Exam Insight
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A) 1
B) -1
C) -3
D) 3
✔ Correct Answer: -3
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