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56. Use random sampling to determine the probability that the quadratic equation ax+bx+c= 0 has only real roots, if each of its coefficients a,

56. Use random sampling to determine the probability that the quadratic equation ax+bx+c= 0 has only real roots, if each of its coefficients a, b and c is randomly chosen from the interval (-1, 1]. Also justify your result analytically.

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