Problem 597. The Birthday Phenomenon

Created by Ben Ausdenmoore

First off, leap years are not being considered for this. In fact the year that people are born shouln't be taken into consideration, for simplicity =P.

The basic question is given an input, a single integer representing the number of people in the room (X >= 1). Return the probability that 2 or more people share the same birthday.

The return from the function should be a value between 0 and 1, inclusive. It should also be rounded out to the 10 thousandth decimal point (4 after the decimal point). There should be no trailing zeros included.

*Side note: being my first problem I'm certainly open to critques as far as setting it up, clarity and of course the test suite.

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