If you have a club of fifteen people. You need to pick a president, treasurer, and secretary from the fifteen. How many different ways can you this be accomplished? Leave answer as whole number.Answer please :

An experiment is to flip a fair coin three times. What is the probability of getting exactly two heads?

If in a box there are 4 red cards and 7 blue cards. If you pick a card without looking at the box, what is the probability that you pick a blue card?

Thanks!