Which scenarios are combinations?There are eighteen players on a school soccer team. How many ways can two players be chosen as captain and co-captain?School spirit shirts can be ordered in sizes S, M, L, or XL. They offer both short-sleeve shirts and long-sleeve shirts. How many different ways are there to order a school spirit shirt?Bingo games have seventy-five balls that are called out at random until a player calls bingo. Each ball is labeled 1 to 75. How many ways are there for picking five numbers?An ice cream parlor offers twenty-one varieties of ice cream. How many possible ways are there to choose three different scoops of Ice cream for a banana split?The ballot for student council is for president, vice president, secretary, and treasurer. There is a total of nine candidates for all the positions combined. The president will be the one with the most votes, vice president will be the one with the second highest number of votes, and so on. How many ways can the positions be filled?