Question 602407
P(not a face card | 4) = "Probability of NOT drawing a face card given you've drawn a four"


Since you know 100% that you've drawn a four card, and a four card is NOT a face card, this means that 


P(not a face card | 4) = <font color="red"> 0</font>


Since it's impossible to draw a face card given that you know this information.