There are 5 third year and 4 fourth year students qualified to join a contest. In the group category, a team of four has to be chosen.  a.) How many different teams can be chosen if there must be exactly one third year student on the team? b.)How many different teams can be chosen if there must be exactly two third year students on the team? c.) How many different teams can be chosen if there must be either exactly one third year student or exactly two third year students  on the team?

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Q: formed

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