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Q:

If x = b+c -2a, y=c+a-2b, z=a+b-2c, then the value of x2+y2-z2+2xy is : 

  • 1
    a-b+c
  • 2
    a+b-c
  • 3
    0
  • 4
    a+b+c
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Answer : 3. "0"

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