Sum of first n natural numbers = n (n+1)/2
Sum of the squares of first n natural numbers = n(n+1)(2n+1)/6
Sum of the cubes of first n natural numbers = [n(n+1)/2]^2
Sum of first n natural odd numbers = n^2
Average = (sum of items)/ (number of items)
Sum of the squares of first n natural numbers = n(n+1)(2n+1)/6
Sum of the cubes of first n natural numbers = [n(n+1)/2]^2
Sum of first n natural odd numbers = n^2
Average = (sum of items)/ (number of items)
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