TEST $1$: Using the discrete$-$time signals $x_1[n]$ and $x_2[n]$ where:

Write a MATLAB program to determine the following:

a$.y_1[n]=x_1[-n-2]+x_2[n-3]$

b$.y_2[n]=x_2[-n+4]$

c$.y_3[n]=x_1[n-1]*x_2[2n]$

matlab