# Python Data Structures and Algorithms - Recursion: Calculate the geometric sum

## Python Recursion: Exercise-9 with Solution

Write a Python program to calculate the geometric sum of n-1.

*Note* : In mathematics, a geometric series is a series with a constant ratio between successive terms.

Example :

**Sample Solution**:-

**Python Code:**

```
def geometric_sum(n):
if n < 0:
return 0
else:
return 1 / (pow(2, n)) + geometric_sum(n - 1)
print(geometric_sum(7))
print(geometric_sum(4))
```

Sample Output:

1.9921875 1.9375

**Flowchart:**

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**Previous:** Write a Python program to calculate the harmonic sum of n-1.

**Next:** Write a Python program to calculate the value of 'a' to the power 'b'.

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## Python: Tips of the Day

**Decapitalizes the first letter of a string:**

Example:

def tips_decapitalize(s, upper_rest=False): return s[:1].lower() + (s[1:].upper() if upper_rest else s[1:]) print(tips_decapitalize('PythonTips')) print(tips_decapitalize('PythonTips', True))

Output:

pythonTips pYTHONTIPS

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