[mypy] Fix type annotations for maths directory

maths/series/geometric_series.py

@@ -10,11 +10,14 @@
 """
 
 
+from typing import Union
+
+
 def geometric_series(
-    nth_term: float | int,
-    start_term_a: float | int,
-    common_ratio_r: float | int,
-) -> list[float | int]:
+    nth_term: Union[float, int],
+    start_term_a: Union[float, int],
+    common_ratio_r: Union[float, int],
+) -> list[Union[float, int]]:
     """
     Pure Python implementation of Geometric Series algorithm
 
@@ -45,7 +48,7 @@ def geometric_series(
     """
     if not all((nth_term, start_term_a, common_ratio_r)):
         return []
-    series = []
+    series: list[Union[float, int]] = []
     power = 1
     multiple = common_ratio_r
     for _ in range(int(nth_term)):
@@ -62,11 +65,3 @@ def geometric_series(
     import doctest
 
     doctest.testmod()
-
-    nth_term = float(input("Enter the last number (n term) of the Geometric Series"))
-    start_term_a = float(input("Enter the starting term (a) of the Geometric Series"))
-    common_ratio_r = float(
-        input("Enter the common ratio between two terms (r) of the Geometric Series")
-    )
-    print("Formula of Geometric Series => a + ar + ar^2 ... +ar^n")
-    print(geometric_series(nth_term, start_term_a, common_ratio_r))