Project b=[1 2 3 4]Tb = [1\ 2\ 3\ 4]^Tb=[1 2 3 4]T onto A's column space and the resulting vector is c. K is equal to the multiplication of all the elements of c. What is mod(round(∣K×4∣),5)\text{mod}(\text{round}(|K \times 4|), 5)mod(round(∣K×4∣),5)?
