Find the sum of the product of every pair of the first `n` of natural number

If S_(n) denotes the sum of the products of the products of the first n natureal number taken two at a time

The sum of the first n odd natural number is

Sum of cube of first n natural number

Find the sum of the first n odd natural numbers

The sum of first n odd natural number is

Find the sum of the first n natural numbers.

The sum of first n odd natural numbers is

Find the sum of : the first n natural numbers

Find the sum of first n natural numbers.