The high school concert choir has 7 boys and 15 girls. The teacher needs to pick three soloists for the next concert But all of the members are so good she decides to randomly select the three students for the solos. a) In how many ways can the teacher select the 3 students?
b) What is the probability that all three students selected are girls
c) What is the probability that at least one boy is selected?​

What is the best reason for jacinta to have a savings account in addition to a checking account

What is the perimeter of trapezoid jklm? + units 2 + + units 9 + units 9 + + units

Suppose that 3% of all athletes are using the endurance-enhancing hormone epo (you should be able to simply compute the percentage of all athletes that are not using epo). for our purposes, a “positive” test result is one that indicates presence of epo in an athlete’s bloodstream. the probability of a positive result, given the presence of epo is .99. the probability of a negative result, when epo is not present, is .90. what is the probability that a randomly selected athlete tests positive for epo? 0.0297