It is a beautiful day at the beach and ten beach volleyball players have shown up at the volleyball courts. Each two-person volleyball team should consist of a setter and a spiker. Five of the players prefer to be a spiker, four of the players prefer to be a setter, and one player is fine either way.
In how many ways can a two-person team be assembled such that no player feels out of position?
(this question was already posted, but the answer was wrong, can someone help me?)
Take a look at CPhill's correct-a-mucho answer here:
https://web2.0calc.com/questions/it-is-a-beautiful-day-at-the-beach-and-ten-beach