# Sum of the first nth terms of series

This is my code

``````def series_sum(n):
lst = []
if n == 1:
lst.append("1.00")
return lst
else:
lst =["1.00"]
first_deno = 4
for numbers in range(2,n+1):
print("the numbers",numbers)
first_deno += 3
return str((lst[-1]))

print(series_sum(5))
``````

The Exercise

Your task is to write a function which returns the sum of following series upto nth term(parameter).

• 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.

Examples of output is
1 → 1 → “1.00”
2 → 1 + 1/4 → “1.25”
5 → 1 + 1/4 + 1/7 + 1/10 + 1/13 → “1.57”

It is giving me an error here, I don’t understand why

Traceback (most recent call last):
File “tests.py”, line 2, in
from solution import series_sum
File “/workspace/default/solution.py”, line 15
first_deno += 3
^
SyntaxError: invalid syntax

Me neither - I copied the code and it runs without problem.

That said, that’s a highly inefficient way to write this. You are creating a pointless list and not utilizing the range-object properly.

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