<jupyter_start><jupyter_text><jupyter_code>def sum_of_square2(n):
    sum = n*(n+1)*(2*n+1)/6
    return sum

num = int(input('Enter a number: '))
sum = sum_of_square2(num)
print('Your sum of Square is: ', sum)<jupyter_output>Enter a number: 9
Your sum of Square is:  285.0
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