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If `alpha , beta ` are the roots of the quadratic equation ` (p^2 + p + 1) x^2 + (p - 1) x + p^2 = 0 ` such that unity lies between the roots then the set of values of ` p ` is (i) `O/` (ii) `p in (-infty,-1) cup (0,infty)` (iii) `p in (-1,infty)` (iv) `(-1,1)`

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The correct Answer is:
`p in(-1,0)`
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