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Question is

The expanded form of (x + 2y + z)2 is

  • x2 + 4y2 + z2 + 4xy + 4yz + 2zx

     

  •  x2 + 4y2 + z2 + 2xy + 2yz + zx
  • x2 + 4y2 + z2 + 4xy + 2yz + 4zx
  • x2 + 4y2 + z2 + 4xy + 4yz + 4zx

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