i) A director has to choose 4 actors to play the roles of Matthew, mark, Luke and John in a Bible play. If he has 3 male actors to choose from, how many ways can he assign the roles?

ii) A drug company needs 5 subjects to test their new covid-19 vaccine. Twenty volunteers signed up for this trial. How many groups of 5 test subjects can the drug company choose ?

iii)The conductor of an orchestra needs to select 4 of his trumpet players to have them play in a mariachi band. If the orchestra has to trumpet players, how many different ways can he choose ?

iv) A couple needs to pitch a first name and a middle name for the baby they are expecting. If they hawowedflieir choices to 12 possible names, how many ways can he fest name & middle name be selected ?