. Given all the start-up activity going on in high-tech, you realize that applying combinatorics to investment strategies might be an interesting idea to pursue. Say you have $20 million that must be invested among 4 possible companies. Each investment must be in integral units of $1 million, and there are minimal investments that need to be made if one is to invest in these companies. The minimal investments are $1, $2, $3, and $4 million dollars, respectively for company 1, 2, 3, and 4. How many different invest