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Multiple choice

If $a,b,c$ are non-zero numbers and the equation $ax^{2}+bx+c+i=0$ has purely imaginary roots, then

  1. $a=bc$
  2. $a=b^{2}c$
  3. $a=\sqrt {bc}\ if\ b > 0$
  4. $none\ of\ these$
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