Solve using MATLAB (not by paper) please give step to step explanations, more than one method in solving will be appreciated

3. Write a script to solve the following problems using only array operations: a. Given a matrix mat with Mrows and N columns, create a new matrix called matNew that contains the odd numbered columns and even numbered rows of mat. Your solution should work for any value of Mand N. b. Find the sum and average of all the elements of mat. c. Find the largest and smallest elements in mat