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Q:

What is the value of a2+b2+c2-2ab-2bc+2ca?

  • 1
    (2a + b + c)2
  • 2

    (a − b + c)2

  • 3

    (a − b − 2c)2

  • 4

    (a + 2b − c)2

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Answer : 2. "

(a − b + c)2

"

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