On a high school varsity baseball team, 12 players are sophomores, 10 are juniors, and 8 are seniors. The team selects 3 honorary co-captains by drawing names from a hat. What's the probability that all 3 co-captains were juniors?

How to do this , and can some one explain

Is the response to the survey question "did you smoke in the last week question mark "response to the survey question "did you smoke in the last week? " a discrete random variable, a continuous random variable, or not a random variable?

Find the measurement of angle b in the following triangle