Answer
Set: {2♦,2♣,2♠,2♥,3♦,3♣,3♠,3♥,4♦,4♣,4♠,4♥}
Probability 12/52 or 23.1%
Work Step by Step
The event that a card's denomination is at most 4 is all cards 2, 3, and 4 of all suits, giving a total of 12. The probability is therefore 12/52 or 23.1%