If both roots of quadratic equation $(\alpha +1)x^{2}-2(1+3\alpha )x+1+8\alpha =0$ are real and distinict, the $\alpha$ be-
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If both roots of quadratic equation $(\alpha +1)x^{2}-2(1+3\alpha )x+1+8\alpha =0$ are real and distinict, the $\alpha$ be-