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The probability of choosing randomly a number c from the set {1,2,3,......,9} such that the quadratic equation $x^2+4x+c=0$ has real roots is :

\[\begin {array} {1 1} (1)\;\frac{1}{9} & \quad (2)\;\frac{2}{9} \\ (3)\;\frac{3}{9} & \quad (4)\;\frac{4}{9} \end {array}\]

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answered Nov 7, 2013 by pady_1

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