A good answer might be:

Matrix    x   Col. Matrix    =   Resulting Col. Matrix

5 x 5           5 x 1        =        5 x 1

More Practice

For each row in the following table, decide if the matrix times column matrix product can be formed and what the dimensions of the result will be.

Matrix Col. Matrix Result
3 x 3 3 x 1
3 x 2 2 x 1
2 x 3 2 x 1
4 x 3 3 x 1
3 x 5 5 x 1


QUESTION 3:

Do you think that it is possible to form a product that looks like this: 

Col. Matrix  x  Matrix   =   Result

  2 x 1         2 x 2    =    ???

(Hint: do the dimensions look compatible?)