The game of monopoly has 4 railroad properties 2 utility properties 2 properties each of dark purple and dark blue and 3 properties each of light blue pink orange red yellow and green what is the probability of not selecting a railroad property from the stack of property cards?

Me solve this problem, and someone clearly explain to me how to solve it.1.) use the value of the discriminant to determine if the given trinomials has 2 real solutions, 1 real solution, or no real solutions.a.  x2  − 4x  − 7 = 0b. 4r2  + 11r  − 3 = 0c. 3m2  + 7 = 0d.  t2  + 2t  + 1 = 0