The mathematical formula to find the sum of 1²+2²+3²+….+n² is n(n+1)(2n+1)/6

So to find the sum of series we use this formula.

**Program: **

n = int(input("Enter Positive Number : "))

sum = 0

sum= (n*(n+1)*(2*n + 1))/6

print("The Sum of Series is",sum)

**Output:**

Enter Positive Number : 5

The Sum of Series is 55.0

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