4. Use fr-end loop to calculate numerical equation Write a program in a script file nad PBask3p4.m to calculate the sum of the first n terms of the series: 1.2-3 The program asks the user to enter the number of n in command window; and then display the result in command window. Run the script file for n 4 andn 20, respectively, and show the result in the command window like the following format The result for n B is 1.322298