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1346

Q:

If a=x+y, b=x-y, c=x+2y, then $$ {a^2+b^2+c^2}-ab-bc-ca $$ is

  • 1
    $${4y^2}$$
  • 2
    $${5y^2}$$
  • 3
    $${6y^2}$$
  • 4
    $${7y^2}$$
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Answer : 4. "$${7y^2}$$"

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