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If $ax^{2}+bx+c= 0$ and $2a,b$ and $2c$ are in arithmetic progression, which of the following are the roots of the equation?

  1. $a,c \\$
  2. $-a,-c \\$
  3. $-\dfrac{a}{2},-\dfrac{c}{2} \\$
  4. $-\dfrac{c}{a},-1$
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