Let sum be `S_(n)` then `S_(n)=1+2+3+....+n,=(n)/(2)[2+n]=[(n(n+1))/(2)]`
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Let S_(n) denote the sum of the cubes of the first n natural numbers and s_(n) denote the sum of the first n natural numbers.Then sum_(r=1)^(n)(S_(r))/(s_(r)) is equal to