There are 4 types of computers: supercomputers, computers, mid-range computers, and personal computers. (hint: me)

Use a while-end loop in a script file to calculate the sum of the first n terms of the series: summation sign on the top n bottom k=1 : )^k * k^2 +5k)/3^k show the script file and the two results of n = 10 and n = 20.