code: def _sumSeries(a: float, b: float, steps: int) -> float:
          
          return a * (exp(b * steps) - 1) / (exp(b) - 1)
docs: Return value of the the following polynomial.
          .. math::
             (a * e^(b*steps) - 1) / (e^b - 1)
  
          :param a: multiplier
          :param b: exponent multiplier
          :param steps: the number of steps