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Source: OG11th

Level: 3

An operation ◎ is defined by the equation a◎b=(a-b)/(a+b), for all numbers a and b such that a ≠ -b. If a ≠ -c and a ◎ c = 0, then c =

  • A #NAME?
  • B
  • C 0
  • D
  • E a

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