An electric component manufactured by a company is tested for its defectiveness by a sophisticated device. Let ‘A’ denote the event “the device is defective” and ‘B’ the event “the testing device reveals the component to be defective” Suppose $P\left(A\right)=\alpha$ and $P\left(\frac{B}{A}\right)=P\left(\frac{\overline{B}}{\overline{A}}\right)=1-\alpha$ . Where $0<\alpha <1$ . If it is given that the testing device reveals it to be defective, then the probability that the component is not defective is