Write a recursive method called sumTo that accepts an integer parameter and returns a real number representing the sum of the first reciprocals. In other words, sumTo(n) returns (1 + 1/2 + 1/3 + 1/4+. . .+1/n). For example, sumTo(2) should return 1.5. The method should return 0.0 if it is passed the value 0 and throw an IllegalArgumentException if it is passed a value less than 0.