The following series can be written with a shorthand form of sigma notation (A): (20 points) 3х4 1 į + 2x3 + 3x4 +... n(n+1) Α = Σ = n=1:1000 n(n+1) 1 = In which, Sigma (2) sums up the function determined at n. n(n+1) 1 Create an array for n and use the sum function to calculate this arithmetic series.