Probability - General Questions

A bag contains 5 red, 4 blue and 5 green balls. Two balls are drawn at random. What is the probability that both are red?

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

3 unbiased coins are tossed together. What is the probability of getting at least one head?

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

A bag contains 3 red, 7 blue and 2 green balls. Two balls are drawn at random. What is the probability that both are red?