1. Randomly select a sample of 3 students from 7 students. How many different samples may we have? 2. The Heart Association claims that only 10% of US. adults over 30 years of age meet the minimum requirements established by the President's Council on Fitness, Sports, and Nutrition. Suppose four adults are randomly selected and each is given the fitness test. (a) Find the probability that none of the four adults pass the test. (b) Find the probability that one of the four adults pass the test. (0) Find the probability that two of the four adults pass the test. (d) Find the probability that three of the four adults pass the test. (9) Find the probability that four of the four adults pass the test