Three volunteers are chosen at random from a group of 12 to help at a summer camp. a. What is the probability that you, your brother, and your friend are chosen? Express your answer as a fraction in simplest form. The probability is b. The first person chosen will be a counselor, the second will be a lifeguard, and the third will be a cook. What is the probability that you are the cook, your brother is the lifeguard, and your friend is the counselor? Express your answer as a fraction in simplest form.