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1. Sum of Squares2. Sum of Cubes3. Alternating Sum4. Harmonic Series Sum5. Geometric Series Sum6. Print Nth Row of Pascal Triangle7. Catalan Numbers8. Tribonacci Series9. Lucas Series10. Pell Series

Geometric Series Sum

Calculate a + ar + ar² + ... + arⁿ.

IntermediatePhase 6 - Category 4: Mathematical CombinationsExample 5 of 10
geometric-series-sum.py
1# Take inputs
2a = float(input("Enter first term (a): "))
3r = float(input("Enter common ratio (r): "))
4n = int(input("Enter number of terms (n): "))
5

6# Calculate sum
7total = 0
8for i in range(n):
9    total += a * (r ** i)
10

11print(f"Sum: {total}")

Output

Enter first term (a): 2
Enter common ratio (r): 3
Enter number of terms (n): 4
Sum: 80.0

What's going on

Sum terms of geometric progression.

Key Concepts:

Each term = a * r^i
Loop from 0 to n-1
Accumulate sum

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