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+If a box contains twenty-one coloured discs, composed of fifteen blue discs and six red discs, 
+and two discs were taken at random, it can be seen that the probability of taking two blue discs, 
+`P(BB) = (15/21)x(14/20) = 1/2`.
+
+The next such arrangement, for which there is exactly 50% chance of taking two blue discs at random, 
+is a box containing eighty-five blue discs and thirty-five red discs.
+
+By finding the first arrangement to contain over `10^12 = 1,000,000,000,000` discs in total, 
+determine the number of blue discs that the box would contain.