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Q:

If 2x + 3y - 5z = 18 , 3x + 2y + z = 29 and x + y + 3z = 17 , then what is the value of xy + yz + zx ? 

  • 1
    32
  • 2
    46
  • 3
    64
  • 4
    52
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Answer : 4. "52"

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