First let??equal the first value from Column?, that is,?. Then add??to each of the three values of??in Column??as follows:?,?, and?. Repeat this process for?, for which the possible values of??are?,?, and?; and repeat it again for?, for which the possible values of??are?,?, and?. If you compare these nine values, you see that?,?,?,?, and??are the onlydifferent?possible values of the sums?; therefore, there are five different values possible for?.