Question 1201443
<pre>
The four jacks occupy four of the five positions in the hand. That leaves the fifth card as the only non-jack card.  Since this fifth card can be 48 different cards from the deck, there are 48 hands that have 4 jacks.  

Note that the order of selection does not matter (for example, selecting J,2h,J,J,J results in the same hand as  J,J,J,J,2h).