Sum of Squares | Exact Science

Sum of Squares

Problem Statement

Given a natural number n, calculate the sum:

1² + 2² + … + n²

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Input

A single natural number n (1 ≤ n ≤ 100).

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Output

Print the computed sum.

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Example

input	output
2	5

Factorial (for loop)

Binomial Coefficient

Geometric Progression

For Loop Sum – 1

For Loop Sum – 2