1. The problem statement, all variables and given/known data Find the sum of the products of every pair of the first 'n' natural numbers. 2. Relevant equations sigma n^2 = n(n+1)(2n+1)/6 3. The attempt at a solution S=1.2 + 1.3 + 1.4 .....+ 2.3 + 2.4 ........n-1(n) i cant figure out how to proceed ..