This task was to write a function which returns the sum of following series upto nth term(parameter).
Series: 1 + 1/4 + 1/7 + 1/10 + 1/13 + 1/16 +…
- You need to round the answer to 2 decimal places and return it as String.
- If the given value is 0 then it should return 0.00
- You will only be given Natural Numbers as arguments.