X-1; while x ==1 disp(x) end, then the result a. infinity or b. (1) ​

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.