sum_of_geometric_progression.py

defsum_of_geometric_progression(
first_term: int, common_ratio: int, num_of_terms: int
) ->float:
""" "
 Return the sum of n terms in a geometric progression.
 >>> sum_of_geometric_progression(1, 2, 10)
 1023.0
 >>> sum_of_geometric_progression(1, 10, 5)
 11111.0
 >>> sum_of_geometric_progression(0, 2, 10)
 0.0
 >>> sum_of_geometric_progression(1, 0, 10)
 1.0
 >>> sum_of_geometric_progression(1, 2, 0)
 -0.0
 >>> sum_of_geometric_progression(-1, 2, 10)
 -1023.0
 >>> sum_of_geometric_progression(1, -2, 10)
 -341.0
 >>> sum_of_geometric_progression(1, 2, -10)
 -0.9990234375
 """
ifcommon_ratio==1:
# Formula for sum if common ratio is 1
returnnum_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)