1.
The coefficients a,b,ca, b, c in the quadratic equation ax2+bx+c=0ax^2 + bx + c = 0 are chosen from the set {1,2,3,4,5,6,7,8}\{1, 2, 3, 4, 5, 6, 7, 8\}. The probability of this equation having repeated roots is: