defensive coordinator, statistics homework help

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defensive coordinator, statistics homework help

1. A president and a treasurer are to be chosen from a student club consisting of 50 people. How many different choices of officers are possible if (a) there are no restrictions; (b) A will serve only if he is president; (c) B and C will serve together or not at all; (d) D and E will not serve together? 

2.In a college football training session, the defensive coordinator needs to have 10 players standing in a row. Among these 10 players, there are 1 freshman, 2 sophomores, 4 juniors, and 3 seniors. How many different ways can they be arranged in a row if only their class level will be distinguished?

3. In how many ways can 7 graduate students be assigned to 1 triple and 2 double hotel rooms during a conference? 

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