Six cards are drawn from a well-shuffled deck. You are told that at least an ace (A) is among the cards. What is the probability that there is at least a king (K) or at least a queen (Q)? (A deck consists of 52 cards, with 13 values (A; 2; 3; 4; 5; 6; 7; 8; 9; 10; J; Q;K) each having 4 suits }
I took cases in the denominator (1 ace, 2 aces, 3 aces...) and tried to take the complement (there are no kings, or there are no queens).