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Multiple choice

If $a,b,c$ are positive and are in $AP$, the roots of the quadratic equation $ax^{2}+bx+c=0$ are real for

  1. $\left|\dfrac{c}{a}-7\right|\le4\sqrt{3}$
  2. $\left|\dfrac{a}{c}-7\right|<4\sqrt{3}$
  3. $all\ a\ and\ c$
  4. $No\ a\ and\ c$
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