Fix: Broadened type hints for geometric_progression to allow float inputs and added doctest

Author: Akhila21-6

maths/sum_of_geometric_progression.py

@@ -1,7 +1,11 @@
+from typing import Union
+# ... other imports ...
+
 def sum_of_geometric_progression(
-    first_term: int, common_ratio: int, num_of_terms: int
+    # FIX: Changed 'int' to 'Union[int, float]' to allow non-integer terms/ratios
+    first_term: Union[int, float], common_ratio: Union[int, float], num_of_terms: int
 ) -> float:
-    """ "
+    """
     Return the sum of n terms in a geometric progression.
     >>> sum_of_geometric_progression(1, 2, 10)
     1023.0
@@ -19,10 +23,15 @@ def sum_of_geometric_progression(
     -341.0
     >>> sum_of_geometric_progression(1, 2, -10)
     -0.9990234375
+    
+    # NEW DOCTEST to validate float inputs
+    >>> sum_of_geometric_progression(0.5, 2, 3)
+    3.5
     """
     if common_ratio == 1:
         # Formula for sum if common ratio is 1
         return num_of_terms * first_term
 
     # Formula for finding sum of n terms of a GeometricProgression
-    return (first_term / (1 - common_ratio)) * (1 - common_ratio**num_of_terms)
+    # Note: Python's standard float arithmetic handles this correctly for the fix.
+    return (first_term / (1 - common_ratio)) * (1 - common_ratio**num_of_terms)