Well we can choose the 5 cards in 52 C 5 ways
How many ways can we choose the cards so there is no face card
There are 12 face cards in the pack so, if we take those out we can choose from 40
So 40 C 5 ways
So number of ways with at least one face card is 52 C 5 - 40 C 5
So required probability = (52 C 5 - 40 C 5) / (52 C 5)