यदि x=b+c-2a, y=c+a-2b, z=a+b-2c, हो तो x2+y2-z2+2xy का मान क्या होगा

  • 1

    0

  • 2

    a+b+c

  • 3

    a-b+c

  • 4

    a+b-c

Answer:- 1

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