This Python tutorial gives an easy way to find the sum of cubes of first n natural numbers i.e., 1*1*1+2*2*2+3*3*3+.....n*n*n.
This Python tutorial gives an easy way to find the sum of squares of first n natural numbers i.e., 1*1+2*2+3*3+......n*n.
This tutorial helps you learn the backtracking approach for solving sum of subsets problem.