Python: division error

Heres my method:

def geometricSum(commonRatio, firstTerm, lastTerm):
    return ((firstTerm - lastTerm) * commonRatio) / (1 - commonRatio)

Interpreter testing:

    >>> geometricSum(1.0,1.0,100.0)
    Traceback (most recent call last):
      File "<interactive input>", line 1, in <module>
        File "F:\PortablePython_1.1_py3.0.1\", line 2, in geometricSum
          return ((firstTerm-lastTerm)*commonRatio)/(1-commonRatio)
    ZeroDivisionError: float division


You're dividing by zero. commonRatio is 1.0 so the denominator is 1-1.0 = 0.

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