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Q: If x + y + z = 25, x³ + y³ + z³ = 85 and xyz = 20 then find the value of x² + y² + z² –xy – yz – zx
  • A. 4
  • B. 3
  • C. 1
  • D. 2
Correct Answer: Option C -
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Explanations:

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