(a) Write a MATLAB code which takes a 6-digit number as input and creates a 6 times 6 diagonal matrix using numbers of your input. Use for loop to create the code and test it using the first six digits of your student ID. (b) Write a MATLAB code which generates a geometric sequence 25, 20, 15, 10, 5, 0 using for loop. (c) Write a MATLAB code which asks a user for an integer number and computes the factorial of that number. Use while loop to create the code