Provide a combinatorial argument to show that if s and t are positive integers with s = 5t, then

s!/{(5!)^t}

is a positive integer.

What is a combinatorial argument? try to relate this expression to permutation or combina-tions. Your answer should not include a lot of algebra (i.e., you should not try to multiply out the factorials to simplify). It should be a simple argument using a couple sentences and the material that we've learned so far.