Oh! Card math! Fun!!
Okay, so out of a 52-card deck of cards, we have 4 fours, 4 fives, 4 sixes, 4 sevens, 4 eights, and 4 nines. Together that is 24 cards. As stated in the problem, there are 52 cards in all. 52 - 24 = 28. This means that you have 28 cards that are not from 4 to 9. So your probability is 28/52 or 7/13.
