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Multiple choice

If one root of the quadratic equation $\left( {a - b} \right){x^2} + ax + 1 = 0$ is double the other root where $x \in $,then the greatest value of b is

  1. $\frac{7}{6}\,$
  2. $\frac{8}{7}$
  3. $\frac{9}{8}$
  4. $\frac{10}{9}$
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