3.) (35 Points) Assume the vector AM contains an even number of elements. Develop a MATLAB script that asks the user for the vector AM and once the vector is found to contain an even number of elements, div?de the product of its even elements by the sum of its odd elements without using the MATLAB functions prod or sum. Store the result in a variable called PDS. If AM is found to contain an odd number of elements, display an error message and prompt the user again for a vector with an even number of elements