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Multiple choice

If $a + b + c = 0 ,$ then the roots of the equation $\left( c ^ { 2 } - a b \right) x ^ { 2 } - 2 \left( a ^ { 2 } - b c \right) x + \left( b ^ { 2 } - a c \right) = 0$ are

  1. imaginary

  2. real and equal

  3. real and unequal

  4. none of these

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