Probability - General Questions

One card is drawn at random from a well-shuffled pack of 52 cards. What is the probability that it is a spade or an ace?

Two dice are thrown together. What is the probability that the sum of the numbers is 6?

One card is drawn at random from a well-shuffled pack of 52 cards. What is the probability that it is a black queen?

One card is drawn at random from a well-shuffled pack of 52 cards. What is the probability that it is a king?

A bag contains 5 red, 7 blue and 5 green balls. Two balls are drawn at random. What is the probability that both are red?